diff --git a/gc/PKGBUILD b/gc/PKGBUILD
new file mode 100644
index 00000000..4ee4b1e7
--- /dev/null
+++ b/gc/PKGBUILD
@@ -0,0 +1,85 @@
+# Maintainer: Alexey Pavlov <alexpux@gmail.com>
+
+pkgbase=gc
+pkgname=('libgc' 'libgc-devel' 'libatomic_ops-devel')
+pkgver=7.2.d
+pkgrel=1
+pkgdesc="A garbage collector for C and C++"
+arch=('i686' 'x86_64')
+gropus=('libraries')
+url="http://www.hpl.hp.com/personal/Hans_Boehm/gc/"
+license=('GPL')
+source=("http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/${pkgbase}-7.2d.tar.gz"
+		gc-7.2-msys2.patch
+		gc-7.2d-patch64.diff)
+depends=('gcc-libs')
+options=('!libtool')
+md5sums=('91340b28c61753a789eb6077675d87d2'
+         '863ef4700d7f92262f3b282a44316654'
+         'db2dd5909ea0701aa6de2b8153c0b4a4')
+
+prepare() {
+  cd "${srcdir}/${pkgbase}-7.2"
+  
+  patch -p2 -i ${srcdir}/gc-7.2d-patch64.diff
+  patch -p1 -i ${srcdir}/gc-7.2-msys2.patch
+}
+
+build() {
+  cd "${srcdir}/${pkgbase}-7.2"
+  ./configure --build=${CHOST} \
+    --prefix=/usr \
+	--enable-cplusplus \
+	--enable-threads=pthreads \
+	--without-libatomic-ops \
+	--disable-static
+  make
+  
+  # Install to dest
+  make DESTDIR="${srcdir}/dest" install
+  cd libatomic_ops
+  make DESTDIR="${srcdir}/dest" install
+  cd ..
+  
+  rm -rf "${srcdir}/dest/usr/share/gc"
+  install -m755 -d "${srcdir}/dest/usr/share/doc/gc"
+  install -m644 doc/README{,.{changes,contributors,environment,win32}} \
+    "${srcdir}/dest/usr/share/doc/gc/"
+
+  sed -i -e 's/GC_MALLOC 1L/gc 3/' doc/gc.man
+  install -m755 -d "${srcdir}/dest/usr/share/man/man3"
+  install -m644 doc/gc.man "${srcdir}/dest/usr/share/man/man3/gc.3"
+}
+
+package_libgc() {
+  mkdir -p $pkgdir/usr/{bin,share}
+  cp -f ${srcdir}/dest/usr/bin/*.dll $pkgdir/usr/bin/
+  cp -rf ${srcdir}/dest/usr/share/man $pkgdir/usr/share/
+}
+
+package_libgc-devel() {
+  groups=('development')
+  options=('staticlibs')
+  depends=('libgc')
+  
+  mkdir -p $pkgdir/usr/{lib,include}
+  cp -rf ${srcdir}/dest/usr/include/gc $pkgdir/usr/include
+  cp -f ${srcdir}/dest/usr/include/gc*.h $pkgdir/usr/include/
+  
+  cp -f ${srcdir}/dest/usr/lib/lib{cord,gc}*.a $pkgdir/usr/lib/
+  mkdir -p $pkgdir/usr/lib/pkgconfig
+  cp -f ${srcdir}/dest/usr/lib/pkgconfig/bdw-gc.pc $pkgdir/usr/lib/pkgconfig/
+}
+
+package_libatomic_ops-devel() {
+  groups=('development')
+  options=('staticlibs')
+
+  mkdir -p $pkgdir/usr/{lib,include}
+  cp -rf ${srcdir}/dest/usr/include/atomic_ops $pkgdir/usr/include
+  cp -f ${srcdir}/dest/usr/include/atomic_ops*.h $pkgdir/usr/include/
+  
+  cp -f ${srcdir}/dest/usr/lib/libatomic_ops*.a $pkgdir/usr/lib/
+  mkdir -p $pkgdir/usr/lib/pkgconfig
+  cp -f ${srcdir}/dest/usr/lib/pkgconfig/atomic_ops.pc $pkgdir/usr/lib/pkgconfig/
+}
diff --git a/gc/gc-7.2-msys2.patch b/gc/gc-7.2-msys2.patch
new file mode 100644
index 00000000..7fe38a89
--- /dev/null
+++ b/gc/gc-7.2-msys2.patch
@@ -0,0 +1,813 @@
+diff -Naur gc-7.2-orig/config.guess gc-7.2/config.guess
+--- gc-7.2-orig/config.guess	2012-08-10 00:25:12.000000000 +0400
++++ gc-7.2/config.guess	2013-07-10 23:39:51.388671900 +0400
+@@ -804,6 +804,9 @@
+     i*:CYGWIN*:*)
+ 	echo ${UNAME_MACHINE}-pc-cygwin
+ 	exit ;;
++    i*:MSYS*:*)
++	echo ${UNAME_MACHINE}-pc-msys
++	exit ;;
+     *:MINGW*:*)
+ 	echo ${UNAME_MACHINE}-pc-mingw32
+ 	exit ;;
+@@ -844,6 +847,9 @@
+     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
+ 	echo x86_64-unknown-cygwin
+ 	exit ;;
++    amd64:MSYS*:*:* | x86_64:MSYS*:*:*)
++	echo x86_64-unknown-msys
++	exit ;;
+     p*:CYGWIN*:*)
+ 	echo powerpcle-unknown-cygwin
+ 	exit ;;
+diff -Naur gc-7.2-orig/config.sub gc-7.2/config.sub
+--- gc-7.2-orig/config.sub	2012-08-10 00:25:12.000000000 +0400
++++ gc-7.2/config.sub	2013-07-10 23:40:08.263671900 +0400
+@@ -1336,7 +1336,7 @@
+ 	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
+ 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
+ 	      | -chorusos* | -chorusrdb* | -cegcc* \
+-	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
++	      | -cygwin* | -msys* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+ 	      | -mingw32* | -linux-gnu* | -linux-android* \
+ 	      | -linux-newlib* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+diff -Naur gc-7.2-orig/configure gc-7.2/configure
+--- gc-7.2-orig/configure	2012-08-10 00:25:12.000000000 +0400
++++ gc-7.2/configure	2013-07-10 23:54:06.341796900 +0400
+@@ -5022,7 +5022,7 @@
+         $as_echo "#define GC_IRIX_THREADS 1" >>confdefs.h
+ 
+         ;;
+-     *-*-cygwin*)
++     *-*-cygwin* | *-*-msys*)
+         $as_echo "#define GC_WIN32_THREADS 1" >>confdefs.h
+ 
+         if test "${enable_parallel_mark}" = yes; then
+@@ -5294,6 +5294,7 @@
+ # dyld calls anyway.  The same applies to Cygwin.
+   *-*-darwin*) ;;
+   *-*-cygwin*) ;;
++  *-*-msys*) ;;
+   *)
+     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
+ $as_echo_n "checking for dlopen in -ldl... " >&6; }
+@@ -6272,7 +6273,7 @@
+     lt_cv_sys_max_cmd_len=-1;
+     ;;
+ 
+-  cygwin* | mingw* | cegcc*)
++  cygwin* | msys* | mingw* | cegcc*)
+     # On Win9x/ME, this test blows up -- it succeeds, but takes
+     # about 5 minutes as the teststring grows exponentially.
+     # Worse, since 9x/ME are not pre-emptively multitasking,
+@@ -6456,7 +6457,7 @@
+       *-*-mingw* ) # actually msys
+         lt_cv_to_host_file_cmd=func_convert_file_msys_to_w32
+         ;;
+-      *-*-cygwin* )
++      *-*-cygwin* | *-*-msys* )
+         lt_cv_to_host_file_cmd=func_convert_file_cygwin_to_w32
+         ;;
+       * ) # otherwise, assume *nix
+@@ -6464,12 +6465,12 @@
+         ;;
+     esac
+     ;;
+-  *-*-cygwin* )
++  *-*-cygwin* | *-*-msys* )
+     case $build in
+       *-*-mingw* ) # actually msys
+         lt_cv_to_host_file_cmd=func_convert_file_msys_to_cygwin
+         ;;
+-      *-*-cygwin* )
++      *-*-cygwin* | *-*-msys* )
+         lt_cv_to_host_file_cmd=func_convert_file_noop
+         ;;
+       * ) # otherwise, assume *nix
+@@ -6535,7 +6536,7 @@
+ esac
+ reload_cmds='$LD$reload_flag -o $output$reload_objs'
+ case $host_os in
+-  cygwin* | mingw* | pw32* | cegcc*)
++  cygwin* | msys* | mingw* | pw32* | cegcc*)
+     if test "$GCC" != yes; then
+       reload_cmds=false
+     fi
+@@ -6693,7 +6694,7 @@
+   lt_cv_file_magic_test_file=/shlib/libc.so
+   ;;
+ 
+-cygwin*)
++cygwin* | msys*)
+   # func_win32_libid is a shell function defined in ltmain.sh
+   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
+   lt_cv_file_magic_cmd='func_win32_libid'
+@@ -7014,7 +7015,7 @@
+   lt_cv_sharedlib_from_linklib_cmd='unknown'
+ 
+ case $host_os in
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   # two different shell functions defined in ltmain.sh
+   # decide which to use based on capabilities of $DLLTOOL
+   case `$DLLTOOL --help 2>&1` in
+@@ -7506,7 +7507,7 @@
+ aix*)
+   symcode='[BCDT]'
+   ;;
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   symcode='[ABCDGISTW]'
+   ;;
+ hpux*)
+@@ -9534,7 +9535,7 @@
+       # PIC is the default for these OSes.
+       ;;
+ 
+-    mingw* | cygwin* | pw32* | os2* | cegcc*)
++    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       # Although the cygwin gcc ignores -fPIC, still need this for old-style
+@@ -9616,7 +9617,7 @@
+       fi
+       ;;
+ 
+-    mingw* | cygwin* | pw32* | os2* | cegcc*)
++    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       lt_prog_compiler_pic='-DDLL_EXPORT'
+@@ -10093,7 +10094,7 @@
+   extract_expsyms_cmds=
+ 
+   case $host_os in
+-  cygwin* | mingw* | pw32* | cegcc*)
++  cygwin* | msys* | mingw* | pw32* | cegcc*)
+     # FIXME: the MSVC++ port hasn't been tested in a loooong time
+     # When not using gcc, we currently assume that we are using
+     # Microsoft Visual C++.
+@@ -10208,7 +10209,7 @@
+       fi
+       ;;
+ 
+-    cygwin* | mingw* | pw32* | cegcc*)
++    cygwin* | msys* | mingw* | pw32* | cegcc*)
+       # _LT_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
+       # as there is no search path for DLLs.
+       hardcode_libdir_flag_spec='-L$libdir'
+@@ -10666,7 +10667,7 @@
+       export_dynamic_flag_spec=-rdynamic
+       ;;
+ 
+-    cygwin* | mingw* | pw32* | cegcc*)
++    cygwin* | msys* | mingw* | pw32* | cegcc*)
+       # When not using gcc, we currently assume that we are using
+       # Microsoft Visual C++.
+       # hardcode_libdir_flag_spec is actually meaningless, as there is
+@@ -11627,7 +11628,7 @@
+   # libtool to hard-code these into programs
+   ;;
+ 
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   version_type=windows
+   shrext_cmds=".dll"
+   need_version=no
+@@ -11659,6 +11660,12 @@
+ 
+       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
+       ;;
++    msys*)
++      # MSYS DLLs use 'msys-' prefix rather than 'lib'
++      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
++
++      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"
++      ;;
+     mingw* | cegcc*)
+       # MinGW DLLs use traditional 'lib' prefix
+       soname_spec='${libname}`echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+@@ -11693,7 +11700,7 @@
+       # Convert to MSYS style.
+       sys_lib_search_path_spec=`$ECHO "$sys_lib_search_path_spec" | sed -e 's|\\\\|/|g' -e 's| \\([a-zA-Z]\\):| /\\1|g' -e 's|^ ||'`
+       ;;
+-    cygwin*)
++    cygwin* | msys*)
+       # Convert to unix form, then to dos form, then back to unix form
+       # but this time dos style (no spaces!) so that the unix form looks
+       # like /cygdrive/c/PROGRA~1:/cygdr...
+@@ -12357,7 +12364,7 @@
+     lt_cv_dlopen_libs=
+     ;;
+ 
+-  cygwin*)
++  cygwin* | msys*)
+     lt_cv_dlopen="dlopen"
+     lt_cv_dlopen_libs=
+     ;;
+@@ -13607,7 +13614,7 @@
+         esac
+         ;;
+ 
+-      cygwin* | mingw* | pw32* | cegcc*)
++      cygwin* | msys* | mingw* | pw32* | cegcc*)
+ 	case $GXX,$cc_basename in
+ 	,cl* | no,cl*)
+ 	  # Native MSVC
+@@ -14638,7 +14645,7 @@
+     beos* | irix5* | irix6* | nonstopux* | osf3* | osf4* | osf5*)
+       # PIC is the default for these OSes.
+       ;;
+-    mingw* | cygwin* | os2* | pw32* | cegcc*)
++    mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       # Although the cygwin gcc ignores -fPIC, still need this for old-style
+@@ -14708,7 +14715,7 @@
+ 	  ;;
+ 	esac
+ 	;;
+-      mingw* | cygwin* | os2* | pw32* | cegcc*)
++      mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
+ 	# This hack is so that the source file can tell whether it is being
+ 	# built for inclusion in a dll (and should export symbols for example).
+ 	lt_prog_compiler_pic_CXX='-DDLL_EXPORT'
+@@ -15193,7 +15200,7 @@
+   pw32*)
+     export_symbols_cmds_CXX="$ltdll_cmds"
+     ;;
+-  cygwin* | mingw* | cegcc*)
++  cygwin* | msys* | mingw* | cegcc*)
+     case $cc_basename in
+     cl*) ;;
+     *)
+@@ -15462,7 +15469,7 @@
+   # libtool to hard-code these into programs
+   ;;
+ 
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   version_type=windows
+   shrext_cmds=".dll"
+   need_version=no
+@@ -15493,6 +15500,11 @@
+       soname_spec='`echo ${libname} | sed -e 's/^lib/cyg/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+ 
+       ;;
++    msys*)
++      # MSYS DLLs use 'msys-' prefix rather than 'lib'
++      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
++
++      ;;
+     mingw* | cegcc*)
+       # MinGW DLLs use traditional 'lib' prefix
+       soname_spec='${libname}`echo ${release} | $SED -e 's/[.]/-/g'`${versuffix}${shared_ext}'
+@@ -15527,7 +15539,7 @@
+       # Convert to MSYS style.
+       sys_lib_search_path_spec=`$ECHO "$sys_lib_search_path_spec" | sed -e 's|\\\\|/|g' -e 's| \\([a-zA-Z]\\):| /\\1|g' -e 's|^ ||'`
+       ;;
+-    cygwin*)
++    cygwin* | msys*)
+       # Convert to unix form, then to dos form, then back to unix form
+       # but this time dos style (no spaces!) so that the unix form looks
+       # like /cygdrive/c/PROGRA~1:/cygdr...
+diff -Naur gc-7.2-orig/configure.ac gc-7.2/configure.ac
+--- gc-7.2-orig/configure.ac	2012-08-10 00:25:13.000000000 +0400
++++ gc-7.2/configure.ac	2013-07-10 23:54:50.888671900 +0400
+@@ -205,7 +205,7 @@
+      *-*-irix*)
+         AC_DEFINE(GC_IRIX_THREADS)
+         ;;
+-     *-*-cygwin*)
++     *-*-cygwin*|*-*-msys*)
+         AC_DEFINE(GC_WIN32_THREADS)
+         if test "${enable_parallel_mark}" = yes; then
+           AC_DEFINE(PARALLEL_MARK)
+@@ -369,6 +369,7 @@
+ # dyld calls anyway.  The same applies to Cygwin.
+   *-*-darwin*) ;;
+   *-*-cygwin*) ;;
++  *-*-msys*) ;;
+   *)
+     AC_CHECK_LIB(dl, dlopen, THREADDLLIBS="$THREADDLLIBS -ldl")
+     ;;
+diff -Naur gc-7.2-orig/libatomic_ops/config.guess gc-7.2/libatomic_ops/config.guess
+--- gc-7.2-orig/libatomic_ops/config.guess	2012-08-09 23:56:28.000000000 +0400
++++ gc-7.2/libatomic_ops/config.guess	2013-07-11 06:59:59.209960900 +0400
+@@ -804,6 +804,9 @@
+     i*:CYGWIN*:*)
+ 	echo ${UNAME_MACHINE}-pc-cygwin
+ 	exit ;;
++    i*:MSYS*:*)
++	echo ${UNAME_MACHINE}-pc-msys
++	exit ;;
+     *:MINGW*:*)
+ 	echo ${UNAME_MACHINE}-pc-mingw32
+ 	exit ;;
+@@ -844,6 +847,9 @@
+     amd64:CYGWIN*:*:* | x86_64:CYGWIN*:*:*)
+ 	echo x86_64-unknown-cygwin
+ 	exit ;;
++    amd64:MSYS*:*:* | x86_64:MSYS*:*:*)
++	echo x86_64-unknown-msys
++	exit ;;
+     p*:CYGWIN*:*)
+ 	echo powerpcle-unknown-cygwin
+ 	exit ;;
+diff -Naur gc-7.2-orig/libatomic_ops/config.sub gc-7.2/libatomic_ops/config.sub
+--- gc-7.2-orig/libatomic_ops/config.sub	2012-08-09 23:56:28.000000000 +0400
++++ gc-7.2/libatomic_ops/config.sub	2013-07-11 07:00:19.288085900 +0400
+@@ -1336,7 +1336,7 @@
+ 	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
+ 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
+ 	      | -chorusos* | -chorusrdb* | -cegcc* \
+-	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
++	      | -cygwin* | -msys* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+ 	      | -mingw32* | -linux-gnu* | -linux-android* \
+ 	      | -linux-newlib* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+diff -Naur gc-7.2-orig/libatomic_ops/configure gc-7.2/libatomic_ops/configure
+--- gc-7.2-orig/libatomic_ops/configure	2012-08-09 23:58:11.000000000 +0400
++++ gc-7.2/libatomic_ops/configure	2013-07-11 07:01:19.741210900 +0400
+@@ -4732,7 +4732,7 @@
+ $as_echo_n "checking for PIC compiler flag... " >&6; }
+ if test "$GCC" = yes; then
+   case "$host" in
+-    *-*-cygwin* | *-*-mingw*)
++    *-*-cygwin* | *-*-msys* | *-*-mingw*)
+       # Cygwin and Mingw[-w32/64] do not need -fPIC.
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: \"<none>\"" >&5
+ $as_echo "\"<none>\"" >&6; }
+@@ -4864,7 +4864,7 @@
+     *-*-openbsd* | *-*-kfreebsd*-gnu | *-*-dgux*)
+       THREADDLLIBS=-pthread
+       ;;
+-    *-*-cygwin* | *-*-darwin*)
++    *-*-cygwin* | *-*-msys* | *-*-darwin*)
+       THREADDLLIBS=
+       ;;
+     *-*-mingw*)
+diff -Naur gc-7.2-orig/libatomic_ops/configure.ac gc-7.2/libatomic_ops/configure.ac
+--- gc-7.2-orig/libatomic_ops/configure.ac	2012-08-09 23:56:29.000000000 +0400
++++ gc-7.2/libatomic_ops/configure.ac	2013-07-11 07:00:56.913085900 +0400
+@@ -25,7 +25,7 @@
+ AC_MSG_CHECKING(for PIC compiler flag)
+ if test "$GCC" = yes; then
+   case "$host" in
+-    *-*-cygwin* | *-*-mingw*)
++    *-*-cygwin* | *-*-msys* | *-*-mingw*)
+       # Cygwin and Mingw[-w32/64] do not need -fPIC.
+       AC_MSG_RESULT("<none>")
+       ;;
+@@ -88,7 +88,7 @@
+     *-*-openbsd* | *-*-kfreebsd*-gnu | *-*-dgux*)
+       THREADDLLIBS=-pthread
+       ;;
+-    *-*-cygwin* | *-*-darwin*)
++    *-*-cygwin* | *-*-msys* | *-*-darwin*)
+       THREADDLLIBS=
+       ;;
+     *-*-mingw*)
+diff -Naur gc-7.2-orig/ltmain.sh gc-7.2/ltmain.sh
+--- gc-7.2-orig/ltmain.sh	2012-08-10 00:25:13.000000000 +0400
++++ gc-7.2/ltmain.sh	2013-07-11 06:56:59.741210900 +0400
+@@ -1179,7 +1179,7 @@
+   test "$opt_debug" = : || func_append preserve_args " --debug"
+ 
+   case $host in
+-    *cygwin* | *mingw* | *pw32* | *cegcc*)
++    *cygwin* | *msys* | *mingw* | *pw32* | *cegcc*)
+       # don't eliminate duplications in $postdeps and $predeps
+       opt_duplicate_compiler_generated_deps=:
+       ;;
+@@ -2122,7 +2122,7 @@
+ 
+     # On Cygwin there's no "real" PIC flag so we must build both object types
+     case $host_os in
+-    cygwin* | mingw* | pw32* | os2* | cegcc*)
++    cygwin* | msys* | mingw* | pw32* | os2* | cegcc*)
+       pic_mode=default
+       ;;
+     esac
+@@ -2991,7 +2991,7 @@
+ 	      'exit $?'
+ 	  tstripme="$stripme"
+ 	  case $host_os in
+-	  cygwin* | mingw* | pw32* | cegcc*)
++	  cygwin* | msys* | mingw* | pw32* | cegcc*)
+ 	    case $realname in
+ 	    *.dll.a)
+ 	      tstripme=""
+@@ -3097,7 +3097,7 @@
+ 
+ 	# Do a test to see if this is really a libtool program.
+ 	case $host in
+-	*cygwin* | *mingw*)
++	*cygwin* | *msys* | *mingw*)
+ 	    if func_ltwrapper_executable_p "$file"; then
+ 	      func_ltwrapper_scriptname "$file"
+ 	      wrapper=$func_ltwrapper_scriptname_result
+@@ -3172,7 +3172,7 @@
+ 	# remove .exe since cygwin /usr/bin/install will append another
+ 	# one anyway
+ 	case $install_prog,$host in
+-	*/usr/bin/install*,*cygwin*)
++	*/usr/bin/install*,*cygwin*|*/usr/bin/install*,*msys*)
+ 	  case $file:$destfile in
+ 	  *.exe:*.exe)
+ 	    # this is ok
+@@ -3320,7 +3320,7 @@
+ 	      $RM $export_symbols
+ 	      eval "${SED} -n -e '/^: @PROGRAM@ $/d' -e 's/^.* \(.*\)$/\1/p' "'< "$nlist" > "$export_symbols"'
+ 	      case $host in
+-	      *cygwin* | *mingw* | *cegcc* )
++	      *cygwin* | *msys* | *mingw* | *cegcc* )
+                 eval "echo EXPORTS "'> "$output_objdir/$outputname.def"'
+                 eval 'cat "$export_symbols" >> "$output_objdir/$outputname.def"'
+ 	        ;;
+@@ -3332,7 +3332,7 @@
+ 	      eval '$GREP -f "$output_objdir/$outputname.exp" < "$nlist" > "$nlist"T'
+ 	      eval '$MV "$nlist"T "$nlist"'
+ 	      case $host in
+-	        *cygwin* | *mingw* | *cegcc* )
++	        *cygwin* | *msys* | *mingw* | *cegcc* )
+ 	          eval "echo EXPORTS "'> "$output_objdir/$outputname.def"'
+ 	          eval 'cat "$nlist" >> "$output_objdir/$outputname.def"'
+ 	          ;;
+@@ -3346,7 +3346,7 @@
+ 	  func_basename "$dlprefile"
+ 	  name="$func_basename_result"
+           case $host in
+-	    *cygwin* | *mingw* | *cegcc* )
++	    *cygwin* | *msys* | *mingw* | *cegcc* )
+ 	      # if an import library, we need to obtain dlname
+ 	      if func_win32_import_lib_p "$dlprefile"; then
+ 	        func_tr_sh "$dlprefile"
+@@ -3499,7 +3499,7 @@
+ 	# Transform the symbol file into the correct name.
+ 	symfileobj="$output_objdir/${my_outputname}S.$objext"
+ 	case $host in
+-	*cygwin* | *mingw* | *cegcc* )
++	*cygwin* | *msys* | *mingw* | *cegcc* )
+ 	  if test -f "$output_objdir/$my_outputname.def"; then
+ 	    compile_command=`$ECHO "$compile_command" | $SED "s%@SYMFILE@%$output_objdir/$my_outputname.def $symfileobj%"`
+ 	    finalize_command=`$ECHO "$finalize_command" | $SED "s%@SYMFILE@%$output_objdir/$my_outputname.def $symfileobj%"`
+@@ -4369,7 +4369,7 @@
+ 	{
+ EOF
+ 	    case "$host" in
+-	      *mingw* | *cygwin* )
++	      *mingw* | *cygwin* | *msys* )
+ 		# make stdout use "unix" line endings
+ 		echo "          setmode(1,_O_BINARY);"
+ 		;;
+@@ -5082,7 +5082,7 @@
+ {
+     $opt_debug
+     case $host in
+-    *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
++    *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+       # It is impossible to link a dll without this setting, and
+       # we shouldn't force the makefile maintainer to figure out
+       # which system we are compiling for in order to pass an extra
+@@ -5569,7 +5569,7 @@
+ 	  ;;
+ 	esac
+ 	case $host in
+-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
++	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+ 	  testbindir=`$ECHO "$dir" | $SED 's*/lib$*/bin*'`
+ 	  case :$dllsearchpath: in
+ 	  *":$dir:"*) ;;
+@@ -5589,7 +5589,7 @@
+       -l*)
+ 	if test "X$arg" = "X-lc" || test "X$arg" = "X-lm"; then
+ 	  case $host in
+-	  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-beos* | *-cegcc* | *-*-haiku*)
++	  *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-beos* | *-cegcc* | *-*-haiku*)
+ 	    # These systems don't actually have a C or math library (as such)
+ 	    continue
+ 	    ;;
+@@ -5666,7 +5666,7 @@
+ 
+       -no-install)
+ 	case $host in
+-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-darwin* | *-cegcc*)
++	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-darwin* | *-cegcc*)
+ 	  # The PATH hackery in wrapper scripts is required on Windows
+ 	  # and Darwin in order for the loader to find any dlls it needs.
+ 	  func_warning "\`-no-install' is ignored for $host"
+@@ -6531,7 +6531,7 @@
+ 	  fi
+ 	  case "$host" in
+ 	    # special handling for platforms with PE-DLLs.
+-	    *cygwin* | *mingw* | *cegcc* )
++	    *cygwin* | *msys* | *mingw* | *cegcc* )
+ 	      # Linker will automatically link against shared library if both
+ 	      # static and shared are present.  Therefore, ensure we extract
+ 	      # symbols from the import library if a shared library is present
+@@ -6675,7 +6675,7 @@
+ 	if test -n "$library_names" &&
+ 	   { test "$use_static_libs" = no || test -z "$old_library"; }; then
+ 	  case $host in
+-	  *cygwin* | *mingw* | *cegcc*)
++	  *cygwin* | *msys* | *mingw* | *cegcc*)
+ 	      # No point in relinking DLLs because paths are not encoded
+ 	      func_append notinst_deplibs " $lib"
+ 	      need_relink=no
+@@ -6745,7 +6745,7 @@
+ 	    elif test -n "$soname_spec"; then
+ 	      # bleh windows
+ 	      case $host in
+-	      *cygwin* | mingw* | *cegcc*)
++	      *cygwin* | *msys* | mingw* | *cegcc*)
+ 	        func_arith $current - $age
+ 		major=$func_arith_result
+ 		versuffix="-$major"
+@@ -7605,7 +7605,7 @@
+       if test "$build_libtool_libs" = yes; then
+ 	if test -n "$rpath"; then
+ 	  case $host in
+-	  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-beos* | *-cegcc* | *-*-haiku*)
++	  *-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-*-beos* | *-cegcc* | *-*-haiku*)
+ 	    # these systems don't actually have a c library (as such)!
+ 	    ;;
+ 	  *-*-rhapsody* | *-*-darwin1.[012])
+@@ -8118,7 +8118,7 @@
+ 
+ 	orig_export_symbols=
+ 	case $host_os in
+-	cygwin* | mingw* | cegcc*)
++	cygwin* | msys* | mingw* | cegcc*)
+ 	  if test -n "$export_symbols" && test -z "$export_symbols_regex"; then
+ 	    # exporting using user supplied symfile
+ 	    if test "x`$SED 1q $export_symbols`" != xEXPORTS; then
+@@ -8674,7 +8674,7 @@
+ 
+     prog)
+       case $host in
+-	*cygwin*) func_stripname '' '.exe' "$output"
++	*cygwin* | *msys*) func_stripname '' '.exe' "$output"
+ 	          output=$func_stripname_result.exe;;
+       esac
+       test -n "$vinfo" && \
+@@ -8787,7 +8787,7 @@
+ 	  esac
+ 	fi
+ 	case $host in
+-	*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
++	*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
+ 	  testbindir=`${ECHO} "$libdir" | ${SED} -e 's*/lib$*/bin*'`
+ 	  case :$dllsearchpath: in
+ 	  *":$libdir:"*) ;;
+@@ -8865,7 +8865,7 @@
+         # Disable wrappers for cegcc and mingw32ce hosts, we are cross compiling anyway.
+         wrappers_required=no
+         ;;
+-      *cygwin* | *mingw* )
++      *cygwin* | *msys* | *mingw* )
+         if test "$build_libtool_libs" != yes; then
+           wrappers_required=no
+         fi
+@@ -9012,14 +9012,14 @@
+ 	esac
+ 	# test for cygwin because mv fails w/o .exe extensions
+ 	case $host in
+-	  *cygwin*)
++	  *cygwin* | *msys*)
+ 	    exeext=.exe
+ 	    func_stripname '' '.exe' "$outputname"
+ 	    outputname=$func_stripname_result ;;
+ 	  *) exeext= ;;
+ 	esac
+ 	case $host in
+-	  *cygwin* | *mingw* )
++	  *cygwin* | *msys* | *mingw* )
+ 	    func_dirname_and_basename "$output" "" "."
+ 	    output_name=$func_basename_result
+ 	    output_path=$func_dirname_result
+@@ -9346,7 +9346,7 @@
+ 	  # tests/bindir.at for full details.
+ 	  tdlname=$dlname
+ 	  case $host,$output,$installed,$module,$dlname in
+-	    *cygwin*,*lai,yes,no,*.dll | *mingw*,*lai,yes,no,*.dll | *cegcc*,*lai,yes,no,*.dll)
++	    *cygwin*,*lai,yes,no,*.dll | *msys*,*lai,yes,no,*.dll | *mingw*,*lai,yes,no,*.dll | *cegcc*,*lai,yes,no,*.dll)
+ 	      # If a -bindir argument was supplied, place the dll there.
+ 	      if test "x$bindir" != x ;
+ 	      then
+diff -Naur gc-7.2-orig/m4/libtool.m4 gc-7.2/m4/libtool.m4
+--- gc-7.2-orig/m4/libtool.m4	2012-08-10 00:25:13.000000000 +0400
++++ gc-7.2/m4/libtool.m4	2013-07-11 07:04:29.491210900 +0400
+@@ -1559,7 +1559,7 @@
+     lt_cv_sys_max_cmd_len=-1;
+     ;;
+ 
+-  cygwin* | mingw* | cegcc*)
++  cygwin* | msys* | mingw* | cegcc*)
+     # On Win9x/ME, this test blows up -- it succeeds, but takes
+     # about 5 minutes as the teststring grows exponentially.
+     # Worse, since 9x/ME are not pre-emptively multitasking,
+@@ -1801,7 +1801,7 @@
+     lt_cv_dlopen_libs=
+     ;;
+ 
+-  cygwin*)
++  cygwin* | msys*)
+     lt_cv_dlopen="dlopen"
+     lt_cv_dlopen_libs=
+     ;;
+@@ -2272,7 +2272,7 @@
+   # libtool to hard-code these into programs
+   ;;
+ 
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   version_type=windows
+   shrext_cmds=".dll"
+   need_version=no
+@@ -2304,6 +2304,12 @@
+ m4_if([$1], [],[
+       sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"])
+       ;;
++    msys*)
++      # MSYS DLLs use 'msys-' prefix rather than 'lib'
++      soname_spec='`echo ${libname} | sed -e 's/^lib/msys-/'``echo ${release} | $SED -e 's/[[.]]/-/g'`${versuffix}${shared_ext}'
++m4_if([$1], [],[
++      sys_lib_search_path_spec="$sys_lib_search_path_spec /usr/lib/w32api"])
++      ;;
+     mingw* | cegcc*)
+       # MinGW DLLs use traditional 'lib' prefix
+       soname_spec='${libname}`echo ${release} | $SED -e 's/[[.]]/-/g'`${versuffix}${shared_ext}'
+@@ -2338,7 +2344,7 @@
+       # Convert to MSYS style.
+       sys_lib_search_path_spec=`$ECHO "$sys_lib_search_path_spec" | sed -e 's|\\\\|/|g' -e 's| \\([[a-zA-Z]]\\):| /\\1|g' -e 's|^ ||'`
+       ;;
+-    cygwin*)
++    cygwin* | msys*)
+       # Convert to unix form, then to dos form, then back to unix form
+       # but this time dos style (no spaces!) so that the unix form looks
+       # like /cygdrive/c/PROGRA~1:/cygdr...
+@@ -3094,7 +3100,7 @@
+ esac
+ reload_cmds='$LD$reload_flag -o $output$reload_objs'
+ case $host_os in
+-  cygwin* | mingw* | pw32* | cegcc*)
++  cygwin* | msys* | mingw* | pw32* | cegcc*)
+     if test "$GCC" != yes; then
+       reload_cmds=false
+     fi
+@@ -3150,7 +3156,7 @@
+   lt_cv_file_magic_test_file=/shlib/libc.so
+   ;;
+ 
+-cygwin*)
++cygwin* | msys*)
+   # func_win32_libid is a shell function defined in ltmain.sh
+   lt_cv_deplibs_check_method='file_magic ^x86 archive import|^x86 DLL'
+   lt_cv_file_magic_cmd='func_win32_libid'
+@@ -3460,7 +3466,7 @@
+ [lt_cv_sharedlib_from_linklib_cmd='unknown'
+ 
+ case $host_os in
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   # two different shell functions defined in ltmain.sh
+   # decide which to use based on capabilities of $DLLTOOL
+   case `$DLLTOOL --help 2>&1` in
+@@ -3515,7 +3521,7 @@
+ [AC_REQUIRE([AC_CANONICAL_HOST])dnl
+ LIBM=
+ case $host in
+-*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
++*-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-msys* | *-*-haiku* | *-*-pw32* | *-*-darwin*)
+   # These system don't have libm, or don't need it
+   ;;
+ *-ncr-sysv4.3*)
+@@ -3590,7 +3596,7 @@
+ aix*)
+   symcode='[[BCDT]]'
+   ;;
+-cygwin* | mingw* | pw32* | cegcc*)
++cygwin* | msys* | mingw* | pw32* | cegcc*)
+   symcode='[[ABCDGISTW]]'
+   ;;
+ hpux*)
+@@ -3857,7 +3863,7 @@
+     beos* | irix5* | irix6* | nonstopux* | osf3* | osf4* | osf5*)
+       # PIC is the default for these OSes.
+       ;;
+-    mingw* | cygwin* | os2* | pw32* | cegcc*)
++    mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       # Although the cygwin gcc ignores -fPIC, still need this for old-style
+@@ -3928,7 +3934,7 @@
+ 	  ;;
+ 	esac
+ 	;;
+-      mingw* | cygwin* | os2* | pw32* | cegcc*)
++      mingw* | cygwin* | msys* | os2* | pw32* | cegcc*)
+ 	# This hack is so that the source file can tell whether it is being
+ 	# built for inclusion in a dll (and should export symbols for example).
+ 	m4_if([$1], [GCJ], [],
+@@ -4175,7 +4181,7 @@
+       # PIC is the default for these OSes.
+       ;;
+ 
+-    mingw* | cygwin* | pw32* | os2* | cegcc*)
++    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       # Although the cygwin gcc ignores -fPIC, still need this for old-style
+@@ -4258,7 +4264,7 @@
+       fi
+       ;;
+ 
+-    mingw* | cygwin* | pw32* | os2* | cegcc*)
++    mingw* | cygwin* | msys* | pw32* | os2* | cegcc*)
+       # This hack is so that the source file can tell whether it is being
+       # built for inclusion in a dll (and should export symbols for example).
+       m4_if([$1], [GCJ], [],
+@@ -4503,7 +4509,7 @@
+   pw32*)
+     _LT_TAGVAR(export_symbols_cmds, $1)="$ltdll_cmds"
+     ;;
+-  cygwin* | mingw* | cegcc*)
++  cygwin* | msys* | mingw* | cegcc*)
+     case $cc_basename in
+     cl*) ;;
+     *)
+@@ -4563,7 +4569,7 @@
+   extract_expsyms_cmds=
+ 
+   case $host_os in
+-  cygwin* | mingw* | pw32* | cegcc*)
++  cygwin* | msys* | mingw* | pw32* | cegcc*)
+     # FIXME: the MSVC++ port hasn't been tested in a loooong time
+     # When not using gcc, we currently assume that we are using
+     # Microsoft Visual C++.
+@@ -4681,7 +4687,7 @@
+       fi
+       ;;
+ 
+-    cygwin* | mingw* | pw32* | cegcc*)
++    cygwin* | msys* | mingw* | pw32* | cegcc*)
+       # _LT_TAGVAR(hardcode_libdir_flag_spec, $1) is actually meaningless,
+       # as there is no search path for DLLs.
+       _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='-L$libdir'
+@@ -5056,7 +5062,7 @@
+       _LT_TAGVAR(export_dynamic_flag_spec, $1)=-rdynamic
+       ;;
+ 
+-    cygwin* | mingw* | pw32* | cegcc*)
++    cygwin* | msys* | mingw* | pw32* | cegcc*)
+       # When not using gcc, we currently assume that we are using
+       # Microsoft Visual C++.
+       # hardcode_libdir_flag_spec is actually meaningless, as there is
+@@ -6065,7 +6071,7 @@
+         esac
+         ;;
+ 
+-      cygwin* | mingw* | pw32* | cegcc*)
++      cygwin* | msys* | mingw* | pw32* | cegcc*)
+ 	case $GXX,$cc_basename in
+ 	,cl* | no,cl*)
+ 	  # Native MSVC
+@@ -7799,7 +7805,7 @@
+       *-*-mingw* ) # actually msys
+         lt_cv_to_host_file_cmd=func_convert_file_msys_to_w32
+         ;;
+-      *-*-cygwin* )
++      *-*-cygwin* | *-*-msys* )
+         lt_cv_to_host_file_cmd=func_convert_file_cygwin_to_w32
+         ;;
+       * ) # otherwise, assume *nix
+@@ -7807,12 +7813,12 @@
+         ;;
+     esac
+     ;;
+-  *-*-cygwin* )
++  *-*-cygwin* | *-*-msys* )
+     case $build in
+       *-*-mingw* ) # actually msys
+         lt_cv_to_host_file_cmd=func_convert_file_msys_to_cygwin
+         ;;
+-      *-*-cygwin* )
++      *-*-cygwin* | *-*-msys* )
+         lt_cv_to_host_file_cmd=func_convert_file_noop
+         ;;
+       * ) # otherwise, assume *nix
+diff -Naur gc-7.2-orig/m4/ltoptions.m4 gc-7.2/m4/ltoptions.m4
+--- gc-7.2-orig/m4/ltoptions.m4	2012-08-10 00:25:13.000000000 +0400
++++ gc-7.2/m4/ltoptions.m4	2013-07-11 07:01:43.725585900 +0400
+@@ -126,7 +126,7 @@
+ [enable_win32_dll=yes
+ 
+ case $host in
+-*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
++*-*-cygwin* | *-*-msys* | *-*-mingw* | *-*-pw32* | *-*-cegcc*)
+   AC_CHECK_TOOL(AS, as, false)
+   AC_CHECK_TOOL(DLLTOOL, dlltool, false)
+   AC_CHECK_TOOL(OBJDUMP, objdump, false)
diff --git a/gc/gc-7.2d-patch64.diff b/gc/gc-7.2d-patch64.diff
new file mode 100644
index 00000000..83b05f2d
--- /dev/null
+++ b/gc/gc-7.2d-patch64.diff
@@ -0,0 +1,207 @@
+Only in whatif/gc-7.2: .deps
+Only in whatif/gc-7.2: .libs
+Binary files pristine/gc-7.2/.os_dep.c.swp and whatif/gc-7.2/.os_dep.c.swp differ
+Only in whatif/gc-7.2: allchblk.lo
+Only in whatif/gc-7.2: allchblk.o
+Only in whatif/gc-7.2: alloc.lo
+Only in whatif/gc-7.2: alloc.o
+Only in whatif/gc-7.2: atomic_ops.lo
+Only in whatif/gc-7.2: atomic_ops.o
+Only in whatif/gc-7.2: backgraph.lo
+Only in whatif/gc-7.2: backgraph.o
+Only in whatif/gc-7.2: bdw-gc.pc
+Only in whatif/gc-7.2: blacklst.lo
+Only in whatif/gc-7.2: blacklst.o
+Only in whatif/gc-7.2: checksums.lo
+Only in whatif/gc-7.2: checksums.o
+Only in whatif/gc-7.2: config.log
+Only in whatif/gc-7.2: config.status
+Only in whatif/gc-7.2: cordbscs.lo
+Only in whatif/gc-7.2: cordbscs.o
+Only in whatif/gc-7.2: cordprnt.lo
+Only in whatif/gc-7.2: cordprnt.o
+Only in whatif/gc-7.2: cordtest.lo
+Only in whatif/gc-7.2: cordtest.o
+Only in whatif/gc-7.2: cordxtra.lo
+Only in whatif/gc-7.2: cordxtra.o
+Only in whatif/gc-7.2: dbg_mlc.lo
+Only in whatif/gc-7.2: dbg_mlc.o
+Only in whatif/gc-7.2: dyn_load.lo
+Only in whatif/gc-7.2: dyn_load.o
+Only in whatif/gc-7.2: finalize.lo
+Only in whatif/gc-7.2: finalize.o
+Only in whatif/gc-7.2: gc_dlopen.lo
+Only in whatif/gc-7.2: gc_dlopen.o
+Only in whatif/gc-7.2: gcj_mlc.lo
+Only in whatif/gc-7.2: gcj_mlc.o
+Only in whatif/gc-7.2: headers.lo
+Only in whatif/gc-7.2: headers.o
+diff -ur pristine/gc-7.2/include/gc.h whatif/gc-7.2/include/gc.h
+--- pristine/gc-7.2/include/gc.h	2012-08-09 16:25:13.000000000 -0400
++++ whatif/gc-7.2/include/gc.h	2013-04-22 13:10:01.101686000 -0400
+@@ -1385,7 +1385,14 @@
+ /* THREAD_LOCAL_ALLOC defined and the initial allocation call is not    */
+ /* to GC_malloc() or GC_malloc_atomic().                                */
+ 
+-#ifdef __CYGWIN32__
++#ifdef __CYGWIN__
++#ifdef __x86_64__
++  extern int __data_start__[], __data_end__[], __bss_start__[], __bss_end__[];
++#define GC_DATASTART (__data_start__ < __bss_start__ ?\
++                      (void *)__data_start__ : (void *)__bss_start__)
++#define GC_DATAEND (__data_end__ < __bss_end__ ?\
++                      (void *)__data_end__ : (void *)__bss_end__)
++#else
+   /* Similarly gnu-win32 DLLs need explicit initialization from the     */
+   /* main program, as does AIX.                                         */
+   extern int _data_start__[], _data_end__[], _bss_start__[], _bss_end__[];
+@@ -1393,6 +1400,7 @@
+                        (void *)_data_start__ : (void *)_bss_start__)
+ # define GC_DATAEND (_data_end__ > _bss_end__ ? \
+                      (void *)_data_end__ : (void *)_bss_end__)
++#endif
+ # define GC_INIT_CONF_ROOTS GC_add_roots(GC_DATASTART, GC_DATAEND); \
+                                  GC_gcollect() /* For blacklisting. */
+         /* Required at least if GC is in a DLL.  And doesn't hurt. */
+Only in whatif/gc-7.2/include/private: config.h
+diff -ur pristine/gc-7.2/include/private/gcconfig.h whatif/gc-7.2/include/private/gcconfig.h
+--- pristine/gc-7.2/include/private/gcconfig.h	2012-08-09 16:25:13.000000000 -0400
++++ whatif/gc-7.2/include/private/gcconfig.h	2013-04-21 12:52:28.024399600 -0400
+@@ -432,10 +432,20 @@
+ #   endif
+ #   define mach_type_known
+ # endif
+-# if defined(__CYGWIN32__) || defined(__CYGWIN__)
++# if defined(__CYGWIN32__)
+ #   define I386
+ #   define CYGWIN32
+ #   define mach_type_known
++#if defined(__CYGWIN__)
++#  if defined(__LP64__)
++#    define X86_64
++#    define mach_type_known
++#  else
++#    define I386
++#  endif
++#  define CYGWIN32
++#  define mach_type_known
++#endif
+ # endif
+ # if defined(__MINGW32__) && !defined(mach_type_known)
+ #   define I386
+@@ -502,6 +512,16 @@
+ #    define mach_type_known
+ # endif
+ 
++#if defined(__CYGWIN__)
++#  if defined(__LP64__)
++#    define X86_64
++#    define mach_type_known
++#  else
++#    define I386
++#  endif
++#  define CYGWIN32
++#  define mach_type_known
++#endif
+ /* Feel free to add more clauses here */
+ 
+ /* Or manually define the machine type here.  A machine type is         */
+@@ -2259,6 +2279,19 @@
+ #       define GWW_VDB
+ #       define DATAEND  /* not needed */
+ #   endif
++
++#   ifdef CYGWIN32
++#       define OS_TYPE "CYGWIN32"
++#       define DATASTART ((ptr_t)GC_DATASTART)  /* From gc.h */
++#       define DATAEND   ((ptr_t)GC_DATAEND)
++#       define ALIGNMENT 8
++#       undef STACK_GRAN
++#       define STACK_GRAN 0x10000
++#       ifdef USE_MMAP
++#         define NEED_FIND_LIMIT
++#         define USE_MMAP_ANON
++#       endif
++#   endif
+ # endif /* X86_64 */
+ 
+ # ifdef HEXAGON
+Only in whatif/gc-7.2/include/private: stamp-h1
+Only in whatif/gc-7.2/libatomic_ops: config.log
+Only in whatif/gc-7.2/libatomic_ops: config.status
+Only in whatif/gc-7.2/libatomic_ops/doc: Makefile
+Only in whatif/gc-7.2/libatomic_ops: Makefile
+Only in whatif/gc-7.2/libatomic_ops/pkgconfig: atomic_ops.pc
+Only in whatif/gc-7.2/libatomic_ops/pkgconfig: atomic_ops-uninstalled.pc
+Only in whatif/gc-7.2/libatomic_ops/src: .deps
+Only in whatif/gc-7.2/libatomic_ops/src/atomic_ops: Makefile
+Only in whatif/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps: Makefile
+Only in whatif/gc-7.2/libatomic_ops/src: config.h
+Only in whatif/gc-7.2/libatomic_ops/src: Makefile
+Only in whatif/gc-7.2/libatomic_ops/src: stamp-h1
+Only in whatif/gc-7.2/libatomic_ops/tests: .deps
+Only in whatif/gc-7.2/libatomic_ops/tests: Makefile
+Only in whatif/gc-7.2: libcord.la
+Only in whatif/gc-7.2: libgc.la
+Only in whatif/gc-7.2: libtool
+Only in whatif/gc-7.2: mach_dep.lo
+Only in whatif/gc-7.2: mach_dep.o
+Only in whatif/gc-7.2: Makefile
+Only in whatif/gc-7.2: malloc.lo
+Only in whatif/gc-7.2: malloc.o
+Only in whatif/gc-7.2: mallocx.lo
+Only in whatif/gc-7.2: mallocx.o
+Only in whatif/gc-7.2: mark.lo
+Only in whatif/gc-7.2: mark.o
+Only in whatif/gc-7.2: mark_rts.lo
+Only in whatif/gc-7.2: mark_rts.o
+Only in whatif/gc-7.2: misc.lo
+Only in whatif/gc-7.2: misc.o
+Only in whatif/gc-7.2: new_hblk.lo
+Only in whatif/gc-7.2: new_hblk.o
+Only in whatif/gc-7.2: obj_map.lo
+Only in whatif/gc-7.2: obj_map.o
+diff -ur pristine/gc-7.2/os_dep.c whatif/gc-7.2/os_dep.c
+--- pristine/gc-7.2/os_dep.c	2012-08-09 16:25:13.000000000 -0400
++++ whatif/gc-7.2/os_dep.c	2013-04-22 12:43:32.202498600 -0400
+@@ -770,7 +770,14 @@
+     /* gcc version of boehm-gc).                                        */
+     GC_API int GC_CALL GC_get_stack_base(struct GC_stack_base *sb)
+     {
++# ifdef __x86_64__
++      PNT_TIB pTib = NtCurrentTeb();
++      void * _tlsbase = pTib->StackBase;
++      /*void * _tlsbase = NtCurrentTeb()->pTib.StackBase;*/
++      /*extern void * _tlsbase __asm__ ("%gs:8");*/
++# else
+       extern void * _tlsbase __asm__ ("%fs:4");
++# endif
+       sb -> mem_base = _tlsbase;
+       return GC_SUCCESS;
+     }
+Only in whatif/gc-7.2: os_dep.lo
+Only in whatif/gc-7.2: os_dep.o
+Only in whatif/gc-7.2: pcr_interface.lo
+Only in whatif/gc-7.2: pcr_interface.o
+Only in whatif/gc-7.2: pthread_start.lo
+Only in whatif/gc-7.2: pthread_start.o
+Only in whatif/gc-7.2: pthread_stop_world.lo
+Only in whatif/gc-7.2: pthread_stop_world.o
+Only in whatif/gc-7.2: pthread_support.lo
+Only in whatif/gc-7.2: pthread_support.o
+Only in whatif/gc-7.2: ptr_chck.lo
+Only in whatif/gc-7.2: ptr_chck.o
+Only in whatif/gc-7.2: real_malloc.lo
+Only in whatif/gc-7.2: real_malloc.o
+Only in whatif/gc-7.2: reclaim.lo
+Only in whatif/gc-7.2: reclaim.o
+Only in whatif/gc-7.2: specific.lo
+Only in whatif/gc-7.2: specific.o
+Only in whatif/gc-7.2: stubborn.lo
+Only in whatif/gc-7.2: stubborn.o
+Only in whatif/gc-7.2: thread_local_alloc.lo
+Only in whatif/gc-7.2: thread_local_alloc.o
+Only in whatif/gc-7.2: typd_mlc.lo
+Only in whatif/gc-7.2: typd_mlc.o
+Only in whatif/gc-7.2: win32_threads.lo
+Only in whatif/gc-7.2: win32_threads.o