autoconf2.13: import gentoo patches

especially the clang ones which we will require for
clang v16 compatiblity.

autoconf2.13/PKGBUILD

@@ -2,34 +2,54 @@
 
 pkgname=autoconf2.13
 pkgver=2.13
-pkgrel=5
+pkgrel=6
 pkgdesc="A GNU tool for automatically configuring source code"
 arch=('any')
 license=('GPL2' 'GPL3' 'custom')
 url="https://www.gnu.org/software/autoconf"
 depends=('awk' 'm4' 'diffutils' 'bash' 'perl')
 makedepends=('make')
-# for test-suite
 source=(https://ftp.gnu.org/pub/gnu/autoconf/autoconf-${pkgver}.tar.gz
         0001-autoconf-2.13-version-specific-share-directory.patch
         autoconf2.1-texinfo.patch
-        autoconf-2.13-msys2.patch)
+        autoconf-2.13-msys2.patch
+        autoconf-2.13-Clang-16-fixes-for-various-tests.patch
+        autoconf-2.13-K-R-decls-clang.patch
+        autoconf-2.13-msys2.patch
+        autoconf-2.13-perl-5.26.patch
+        autoconf-2.13-test-fixes.patch)
 sha256sums=('f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e'
             '85257fad008fff943942e676fcc45df76d38429d5807fa59eb3eb1812dcd3a77'
             'bb987bcd817988830d77c7acf377d14ca89629fb1e5dcea4cf193a7b0d44d62f'
-            '4d57e9ab72c5084233fce61bc0d9edb177971de5dd2ec376300dd224b029f87e')
+            '4d57e9ab72c5084233fce61bc0d9edb177971de5dd2ec376300dd224b029f87e'
+            '52aa69dbd82470c3b8d23e35477d40798a16814201c3c206f3cc058d7234d1b6'
+            '54406429dfe85950717e13a0a501f778f340d2395a82f830b740408c5284102c'
+            '4d57e9ab72c5084233fce61bc0d9edb177971de5dd2ec376300dd224b029f87e'
+            '770d85b03a90787950225bdf52e9e14ab66bd5d85dacb422e947fb8f644e55a6'
+            '43929d95e6050642385530df91084d4c073cec5cca727918d5ff84bc1e3059f5')
 
 prepare() {
   cd ${srcdir}/autoconf-${pkgver}
 
+  # MSYS2
   patch -p2 -i ${srcdir}/autoconf2.1-texinfo.patch
   patch -p1 -i ${srcdir}/autoconf-2.13-msys2.patch
   patch -p1 -i ${srcdir}/0001-autoconf-2.13-version-specific-share-directory.patch
+
+  # from gentoo: https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/autoconf/files
+  patch -p1 -i ${srcdir}/autoconf-2.13-test-fixes.patch
+  patch -p1 -i ${srcdir}/autoconf-2.13-perl-5.26.patch
+  patch -p1 -i ${srcdir}/autoconf-2.13-K-R-decls-clang.patch
+  patch -p1 -i ${srcdir}/autoconf-2.13-Clang-16-fixes-for-various-tests.patch
 }
 
 build() {
   cd ${srcdir}/autoconf-${pkgver}
-  ./configure --prefix=/usr --program-suffix=-2.13
+
+  ./configure \
+    --prefix=/usr \
+    --program-suffix=-2.13
+
   make
 }
 

autoconf2.13/autoconf-2.13-Clang-16-fixes-for-various-tests.patch

@@ -0,0 +1,331 @@
+From cb92e8110d1f274b28d5c156a93c525d2b748644 Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Wed, 9 Nov 2022 08:27:53 +0000
+Subject: [PATCH] Clang 16 fixes for various tests
+
+Fixes -Wimplicit-int and -Wimplicit-function-declaration
+issues in various built-in tests.
+
+Noticed when building XEmacs 21.4 (thanks to matsl for reporting).
+
+Bug: https://bugs.gentoo.org/874366
+Signed-off-by: Sam James <sam@gentoo.org>
+--- a/acgeneral.m4
++++ b/acgeneral.m4
+@@ -1988,7 +1988,8 @@ changequote([, ])dnl
+ AC_MSG_CHECKING(size of $1)
+ AC_CACHE_VAL(AC_CV_NAME,
+ [AC_TRY_RUN([#include <stdio.h>
+-main(void)
++#include <stdlib.h>
++int main(void)
+ {
+   FILE *f=fopen("conftestval", "w");
+   if (!f) exit(1);
+--- a/acspecific.m4
++++ b/acspecific.m4
+@@ -371,7 +371,7 @@ changequote(, )dnl
+ 		       sed -e 's/[^a-zA-Z0-9_]/_/g' -e 's/^[0-9]/_/'`"
+ changequote([, ])dnl
+ AC_CACHE_VAL(ac_cv_prog_cc_${ac_cc}_c_o,
+-[echo 'foo(void){}' > conftest.c
++[echo 'int foo(void){}' > conftest.c
+ # Make sure it works both with $CC and with simple cc.
+ # We do the test twice because some compilers refuse to overwrite an
+ # existing .o file with -o, though they will create one.
+@@ -706,6 +706,7 @@ fi
+ if test $ac_cv_header_stdc = yes; then
+   # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+ AC_TRY_RUN([#include <ctype.h>
++#include <stdlib.h>
+ #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+ #define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+ #define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+@@ -819,6 +820,7 @@ esac
+ 
+ AC_CACHE_CHECK(whether closedir returns void, ac_cv_func_closedir_void,
+ [AC_TRY_RUN([#include <sys/types.h>
++#include <stdlib.h>
+ #include <$ac_header_dirent>
+ int closedir(...); int main(void) { exit(closedir(opendir(".")) != 0); }],
+   ac_cv_func_closedir_void=no, ac_cv_func_closedir_void=yes, ac_cv_func_closedir_void=yes)])
+@@ -907,6 +909,8 @@ AC_CACHE_CHECK(type of array argument to getgroups, ac_cv_type_getgroups,
+ changequote(<<, >>)dnl
+ <<
+ /* Thanks to Mike Rendell for this test.  */
++#include <stdlib.h>
++#include <unistd.h>
+ #include <sys/types.h>
+ #define NGID 256
+ #undef MAX
+@@ -988,6 +992,7 @@ AC_DEFUN(AC_FUNC_CLOSEDIR_VOID,
+ [AC_REQUIRE([AC_HEADER_DIRENT])dnl
+ AC_CACHE_CHECK(whether closedir returns void, ac_cv_func_closedir_void,
+ [AC_TRY_RUN([#include <sys/types.h>
++#include <stdlib.h>
+ #include <$ac_header_dirent>
+ int closedir(...); int main(void) { exit(closedir(opendir(".")) != 0); }],
+   ac_cv_func_closedir_void=no, ac_cv_func_closedir_void=yes, ac_cv_func_closedir_void=yes)])
+@@ -1001,7 +1006,9 @@ AC_DEFUN(AC_FUNC_FNMATCH,
+ # Some versions of Solaris or SCO have a broken fnmatch function.
+ # So we run a test program.  If we are cross-compiling, take no chance.
+ # Thanks to John Oleynick and Franc,ois Pinard for this test.
+-[AC_TRY_RUN([int main(void) { exit (fnmatch ("a*", "abc", 0) != 0); }],
++[AC_TRY_RUN([#include <stdlib.h>
++#include <fnmatch.h>
++int main(void) { exit (fnmatch ("a*", "abc", 0) != 0); }],
+ ac_cv_func_fnmatch_works=yes, ac_cv_func_fnmatch_works=no,
+ ac_cv_func_fnmatch_works=no)])
+ if test $ac_cv_func_fnmatch_works = yes; then
+@@ -1038,6 +1045,7 @@ AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped,
+ #include <sys/types.h>
+ #include <fcntl.h>
+ #include <sys/mman.h>
++#include <stdlib.h>
+ 
+ /* This mess was copied from the GNU getpagesize.h.  */
+ #ifndef HAVE_GETPAGESIZE
+@@ -1165,49 +1173,17 @@ AC_DEFUN(AC_FUNC_GETPGRP,
+  *
+  * Snarfed from Chet Ramey's bash pgrp.c test program
+  */
+-#include <stdio.h>
+-#include <sys/types.h>
+-
+-int     pid;
+-int     pg1, pg2, pg3, pg4;
+-int     ng, np, s, child;
++#include <stdlib.h>
+ 
+ int main(void)
+ {
+-        pid = getpid();
+-        pg1 = getpgrp(0);
+-        pg2 = getpgrp();
+-        pg3 = getpgrp(pid);
+-        pg4 = getpgrp(1);
+-
+-        /*
+-         * If all of these values are the same, it's pretty sure that
+-         * we're on a system that ignores getpgrp's first argument.
+-         */
+-        if (pg2 == pg4 && pg1 == pg3 && pg2 == pg3)
+-                exit(0);
+-
+-        child = fork();
+-        if (child < 0)
+-                exit(1);
+-        else if (child == 0) {
+-                np = getpid();
+-                /*
+-                 * If this is Sys V, this will not work; pgrp will be
+-                 * set to np because setpgrp just changes a pgrp to be
+-                 * the same as the pid.
+-                 */
+-                setpgrp(np, pg1);
+-                ng = getpgrp(0);        /* Same result for Sys V and BSD */
+-                if (ng == pg1) {
+-                        exit(1);
+-                } else {
+-                        exit(0);
+-                }
+-        } else {
+-                wait(&s);
+-                exit(s>>8);
+-        }
++    /* XXX: Gentoo: This function used to check for
++    BSD vs POSIX getpgrp but the test fails to compile
++    on modern POSIX systems when not relying on implicit
++    function declarations. It has no value anyway on such
++    systems and it's been removed in newer autoconf.
++    */
++    exit(0);
+ }
+ ], ac_cv_func_getpgrp_void=yes, ac_cv_func_getpgrp_void=no,
+    AC_MSG_ERROR(cannot check getpgrp if cross compiling))
+@@ -1220,9 +1196,7 @@ fi
+ AC_DEFUN(AC_FUNC_SETPGRP,
+ [AC_CACHE_CHECK(whether setpgrp takes no argument, ac_cv_func_setpgrp_void,
+ AC_TRY_RUN([
+-#ifdef HAVE_UNISTD_H
+-#include <unistd.h>
+-#endif
++#include <stdlib.h>
+ 
+ /*
+  * If this system has a BSD-style setpgrp, which takes arguments, exit
+@@ -1230,10 +1204,13 @@ AC_TRY_RUN([
+  */
+ int main(void)
+ {
+-    if (setpgrp(1,1) == -1)
+-	exit(0);
+-    else
+-	exit(1);
++    /* XXX: Gentoo: This function used to check for
++       BSD vs POSIX gsetpgrp but the test fails to compile
++       on modern POSIX systems when not relying on implicit
++       function declarations. It has no value anyway on such
++       systems and it's been removed in newer autoconf.
++    */
++    exit(1);
+ }
+ ], ac_cv_func_setpgrp_void=no, ac_cv_func_setpgrp_void=yes,
+    AC_MSG_ERROR(cannot check setpgrp if cross compiling))
+@@ -1255,9 +1232,11 @@ AC_DEFUN(AC_FUNC_VFORK,
+ AC_CHECK_HEADER(vfork.h, AC_DEFINE(HAVE_VFORK_H))
+ AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
+ [AC_TRY_RUN([/* Thanks to Paul Eggert for this test.  */
++#include <stdlib.h>
+ #include <stdio.h>
+ #include <sys/types.h>
+ #include <sys/stat.h>
++#include <sys/wait.h>
+ #ifdef HAVE_UNISTD_H
+ #include <unistd.h>
+ #endif
+@@ -1270,11 +1249,11 @@ AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
+    but some compilers (e.g. gcc -O) don't grok <vfork.h>.
+    Test for this by using a static variable whose address
+    is put into a register that is clobbered by the vfork.  */
+-static
++static void
+ #ifdef __cplusplus
+ sparc_address_test (int arg)
+ #else
+-sparc_address_test (arg) int arg;
++sparc_address_test (int arg)
+ #endif
+ {
+   static pid_t child;
+@@ -1359,6 +1338,8 @@ AC_DEFUN(AC_FUNC_WAIT3,
+ #include <sys/time.h>
+ #include <sys/resource.h>
+ #include <stdio.h>
++#include <stdlib.h>
++#include <unistd.h>
+ /* HP-UX has wait3 but does not fill in rusage at all.  */
+ int main(void) {
+   struct rusage r;
+@@ -1452,7 +1433,8 @@ done
+ fi
+ 
+ AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
+-[AC_TRY_RUN([find_stack_direction ()
++[AC_TRY_RUN([#include <stdlib.h>
++int find_stack_direction ()
+ {
+   static char *addr = 0;
+   auto char dummy;
+@@ -1582,6 +1564,8 @@ AC_DEFUN(AC_FUNC_UTIME_NULL,
+ # Sequent interprets utime(file, 0) to mean use start of epoch.  Wrong.
+ AC_TRY_RUN([#include <sys/types.h>
+ #include <sys/stat.h>
++#include <stdlib.h>
++#include <utime.h>
+ int main(void) {
+ struct stat s, t;
+ exit(!(stat ("conftestdata", &s) == 0 && utime("conftestdata", (long *)0) == 0
+@@ -1598,6 +1582,7 @@ fi
+ AC_DEFUN(AC_FUNC_STRCOLL,
+ [AC_CACHE_CHECK(for working strcoll, ac_cv_func_strcoll_works,
+ [AC_TRY_RUN([#include <string.h>
++#include <stdlib.h>
+ int main (void)
+ {
+   exit (strcoll ("abc", "def") >= 0 ||
+@@ -1614,6 +1599,7 @@ AC_DEFUN(AC_FUNC_SETVBUF_REVERSED,
+ [AC_CACHE_CHECK(whether setvbuf arguments are reversed,
+   ac_cv_func_setvbuf_reversed,
+ [AC_TRY_RUN([#include <stdio.h>
++#include <stdlib.h>
+ /* If setvbuf has the reversed format, exit 0. */
+ int main (void) {
+   /* This call has the arguments reversed.
+@@ -1646,7 +1632,8 @@ LIBS="-lintl $LIBS"])])])
+ 
+ AC_DEFUN(AC_FUNC_MEMCMP,
+ [AC_CACHE_CHECK(for 8-bit clean memcmp, ac_cv_func_memcmp_clean,
+-[AC_TRY_RUN([
++[AC_TRY_RUN([#include <stdlib.h>
++#include <string.h>
+ int main(void)
+ {
+   char c0 = 0x40, c1 = 0x80, c2 = 0x81;
+@@ -1805,6 +1792,7 @@ AC_TRY_RUN(
+ #if !defined(__STDC__) || __STDC__ != 1
+ #define volatile
+ #endif
++#include <stdlib.h>
+ int main(void) {
+   volatile char c = 255; exit(c < 0);
+ }], ac_cv_c_char_unsigned=yes, ac_cv_c_char_unsigned=no)
+@@ -1819,7 +1807,8 @@ AC_DEFUN(AC_C_LONG_DOUBLE,
+ [if test "$GCC" = yes; then
+   ac_cv_c_long_double=yes
+ else
+-AC_TRY_RUN([int main(void) {
++AC_TRY_RUN([#include <stdlib.h>
++int main(void) {
+ /* The Stardent Vistra knows sizeof(long double), but does not support it.  */
+ long double foo = 0.0;
+ /* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
+@@ -1834,7 +1823,8 @@ fi
+ AC_DEFUN(AC_INT_16_BITS,
+ [AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(int)])dnl
+ AC_MSG_CHECKING(whether int is 16 bits)
+-AC_TRY_RUN([int main(void) { exit(sizeof(int) != 2); }],
++AC_TRY_RUN([#include <stdlib.h>
++int main(void) { exit(sizeof(int) != 2); }],
+  [AC_MSG_RESULT(yes)
+  AC_DEFINE(INT_16_BITS)], AC_MSG_RESULT(no))
+ ])
+@@ -1842,7 +1832,8 @@ AC_TRY_RUN([int main(void) { exit(sizeof(int) != 2); }],
+ AC_DEFUN(AC_LONG_64_BITS,
+ [AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(long)])dnl
+ AC_MSG_CHECKING(whether long int is 64 bits)
+-AC_TRY_RUN([int main(void) { exit(sizeof(long int) != 8); }],
++AC_TRY_RUN([#include <stdlib.h>
++int main(void) { exit(sizeof(long int) != 8); }],
+  [AC_MSG_RESULT(yes)
+  AC_DEFINE(LONG_64_BITS)], AC_MSG_RESULT(no))
+ ])
+@@ -1862,7 +1853,8 @@ AC_TRY_COMPILE([#include <sys/types.h>
+  not big endian
+ #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
+ if test $ac_cv_c_bigendian = unknown; then
+-AC_TRY_RUN([int main (void) {
++AC_TRY_RUN([#include <stdlib.h>
++int main (void) {
+   /* Are we little or big endian?  From Harbison&Steele.  */
+   union
+   {
+@@ -1885,7 +1877,7 @@ AC_DEFUN(AC_C_INLINE,
+ [AC_CACHE_CHECK([for inline], ac_cv_c_inline,
+ [ac_cv_c_inline=no
+ for ac_kw in inline __inline__ __inline; do
+-  AC_TRY_COMPILE(, [} $ac_kw foo(void) {], [ac_cv_c_inline=$ac_kw; break])
++  AC_TRY_COMPILE(, [} $ac_kw int foo(void) {], [ac_cv_c_inline=$ac_kw; break])
+ done
+ ])
+ case "$ac_cv_c_inline" in
+@@ -2275,7 +2267,10 @@ AC_DEFUN(AC_SYS_RESTARTABLE_SYSCALLS,
+    i.e. the pid of the child, which means that wait was restarted
+    after getting the signal.  */
+ #include <sys/types.h>
++#include <sys/wait.h>
+ #include <signal.h>
++#include <stdlib.h>
++#include <unistd.h>
+ ucatch (isig) { }
+ int main (void) {
+   int i = fork (), status;
+@@ -2444,7 +2439,7 @@ if test "$ac_x_libraries" = NO; then
+   # Don't add to $LIBS permanently.
+   ac_save_LIBS="$LIBS"
+   LIBS="-l$x_direct_test_library $LIBS"
+-AC_TRY_LINK(, [${x_direct_test_function}()],
++AC_TRY_LINK([#include <X11/Intrinsic.h>], [${x_direct_test_function}(0)],
+ [LIBS="$ac_save_LIBS"
+ # We can link X programs with no special library path.
+ ac_x_libraries=],

autoconf2.13/autoconf-2.13-K-R-decls-clang.patch

@@ -0,0 +1,346 @@
+https://bugs.gentoo.org/870412
+https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=8b5e2016c7ed2d67f31b03a3d2e361858ff5299b
+
+Backport the K&R decls fix to 2.13 to avoid configure tests
+failing (often "silently", i.e. doesn't fail the build of
+the package overall, just leads to wrong results) with
+newer compilers like the upcoming Clang 16.
+
+From d8ad1096be4352c588b9bc1e16b6758f4f32b96a Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Arsen=20Arsenovi=C4=87?= <arsen@aarsen.me>
+Date: Mon, 19 Sep 2022 01:38:29 +0200
+Subject: [PATCH] ac{general,specific}: declare void param lists, where apt
+
+--- a/acgeneral.m4
++++ b/acgeneral.m4
+@@ -1542,7 +1542,7 @@ extern "C"
+ ])dnl
+ [/* We use char because int might match the return type of a gcc2
+     builtin and then its argument prototype would still apply.  */
+-char $1();
++char $1(void);
+ ]),
+ [$1()],
+ [$2],
+@@ -1597,7 +1597,7 @@ extern "C"
+ ])dnl
+ [/* We use char because int might match the return type of a gcc2
+     builtin and then its argument prototype would still apply.  */
+-char $2();
++char $2(void);
+ ])),
+ 	    [$2()],
+ 	    eval "ac_cv_lib_$ac_lib_var=yes",
+@@ -1733,7 +1733,7 @@ dnl [#]line __oline__ "[$]0"
+ [#]line __oline__ "configure"
+ #include "confdefs.h"
+ [$1]
+-int main() {
++int main(void) {
+ [$2]
+ ; return 0; }
+ ])EOF
+@@ -1777,7 +1777,7 @@ dnl [#]line __oline__ "[$]0"
+ [#]line __oline__ "configure"
+ #include "confdefs.h"
+ [$1]
+-int main() {
++int main(void) {
+ [$2]
+ ; return 0; }
+ ])EOF
+@@ -1934,7 +1934,7 @@ extern "C"
+ ])dnl
+ [/* We use char because int might match the return type of a gcc2
+     builtin and then its argument prototype would still apply.  */
+-char $1();
++char $1(void);
+ ], [
+ /* The GNU C library defines this for functions which it implements
+     to always fail with ENOSYS.  Some functions are actually named
+@@ -1988,7 +1988,7 @@ changequote([, ])dnl
+ AC_MSG_CHECKING(size of $1)
+ AC_CACHE_VAL(AC_CV_NAME,
+ [AC_TRY_RUN([#include <stdio.h>
+-main()
++main(void)
+ {
+   FILE *f=fopen("conftestval", "w");
+   if (!f) exit(1);
+--- a/acspecific.m4
++++ b/acspecific.m4
+@@ -202,7 +202,7 @@ AC_DEFUN(AC_PROG_CC_WORKS,
+ [AC_MSG_CHECKING([whether the C compiler ($CC $CFLAGS $LDFLAGS) works])
+ AC_LANG_SAVE
+ AC_LANG_C
+-AC_TRY_COMPILER([main(){return(0);}], ac_cv_prog_cc_works, ac_cv_prog_cc_cross)
++AC_TRY_COMPILER([int main(void){return(0);}], ac_cv_prog_cc_works, ac_cv_prog_cc_cross)
+ AC_LANG_RESTORE
+ AC_MSG_RESULT($ac_cv_prog_cc_works)
+ if test $ac_cv_prog_cc_works = no; then
+@@ -217,7 +217,7 @@ AC_DEFUN(AC_PROG_CXX_WORKS,
+ [AC_MSG_CHECKING([whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works])
+ AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+-AC_TRY_COMPILER([int main(){return(0);}], ac_cv_prog_cxx_works, ac_cv_prog_cxx_cross)
++AC_TRY_COMPILER([int main(void){return(0);}], ac_cv_prog_cxx_works, ac_cv_prog_cxx_cross)
+ AC_LANG_RESTORE
+ AC_MSG_RESULT($ac_cv_prog_cxx_works)
+ if test $ac_cv_prog_cxx_works = no; then
+@@ -300,7 +300,7 @@ fi])])
+ 
+ AC_DEFUN(AC_PROG_CC_G,
+ [AC_CACHE_CHECK(whether ${CC-cc} accepts -g, ac_cv_prog_cc_g,
+-[echo 'void f(){}' > conftest.c
++[echo 'void f(void){}' > conftest.c
+ if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
+   ac_cv_prog_cc_g=yes
+ else
+@@ -311,7 +311,7 @@ rm -f conftest*
+ 
+ AC_DEFUN(AC_PROG_CXX_G,
+ [AC_CACHE_CHECK(whether ${CXX-g++} accepts -g, ac_cv_prog_cxx_g,
+-[echo 'void f(){}' > conftest.cc
++[echo 'void f(void){}' > conftest.cc
+ if test -z "`${CXX-g++} -g -c conftest.cc 2>&1`"; then
+   ac_cv_prog_cxx_g=yes
+ else
+@@ -371,7 +371,7 @@ changequote(, )dnl
+ 		       sed -e 's/[^a-zA-Z0-9_]/_/g' -e 's/^[0-9]/_/'`"
+ changequote([, ])dnl
+ AC_CACHE_VAL(ac_cv_prog_cc_${ac_cc}_c_o,
+-[echo 'foo(){}' > conftest.c
++[echo 'foo(void){}' > conftest.c
+ # Make sure it works both with $CC and with simple cc.
+ # We do the test twice because some compilers refuse to overwrite an
+ # existing .o file with -o, though they will create one.
+@@ -709,7 +709,7 @@ AC_TRY_RUN([#include <ctype.h>
+ #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+ #define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+ #define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+-int main () { int i; for (i = 0; i < 256; i++)
++int main (void) { int i; for (i = 0; i < 256; i++)
+ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
+ exit (0); }
+ ], , ac_cv_header_stdc=no, :)
+@@ -820,7 +820,7 @@ esac
+ AC_CACHE_CHECK(whether closedir returns void, ac_cv_func_closedir_void,
+ [AC_TRY_RUN([#include <sys/types.h>
+ #include <$ac_header_dirent>
+-int closedir(); main() { exit(closedir(opendir(".")) != 0); }],
++int closedir(...); int main(void) { exit(closedir(opendir(".")) != 0); }],
+   ac_cv_func_closedir_void=no, ac_cv_func_closedir_void=yes, ac_cv_func_closedir_void=yes)])
+ if test $ac_cv_func_closedir_void = yes; then
+   AC_DEFINE(VOID_CLOSEDIR)
+@@ -911,7 +911,7 @@ changequote(<<, >>)dnl
+ #define NGID 256
+ #undef MAX
+ #define MAX(x, y) ((x) > (y) ? (x) : (y))
+-main()
++int main(void)
+ {
+   gid_t gidset[NGID];
+   int i, n;
+@@ -973,7 +973,7 @@ AC_DEFUN(AC_TYPE_SIGNAL,
+ #ifdef __cplusplus
+ extern "C" void (*signal (int, void (*)(int)))(int);
+ #else
+-void (*signal ()) ();
++void (*signal (void)) (void);
+ #endif
+ ],
+ [int i;], ac_cv_type_signal=void, ac_cv_type_signal=int)])
+@@ -989,7 +989,7 @@ AC_DEFUN(AC_FUNC_CLOSEDIR_VOID,
+ AC_CACHE_CHECK(whether closedir returns void, ac_cv_func_closedir_void,
+ [AC_TRY_RUN([#include <sys/types.h>
+ #include <$ac_header_dirent>
+-int closedir(); main() { exit(closedir(opendir(".")) != 0); }],
++int closedir(...); int main(void) { exit(closedir(opendir(".")) != 0); }],
+   ac_cv_func_closedir_void=no, ac_cv_func_closedir_void=yes, ac_cv_func_closedir_void=yes)])
+ if test $ac_cv_func_closedir_void = yes; then
+   AC_DEFINE(CLOSEDIR_VOID)
+@@ -1001,7 +1001,7 @@ AC_DEFUN(AC_FUNC_FNMATCH,
+ # Some versions of Solaris or SCO have a broken fnmatch function.
+ # So we run a test program.  If we are cross-compiling, take no chance.
+ # Thanks to John Oleynick and Franc,ois Pinard for this test.
+-[AC_TRY_RUN([main() { exit (fnmatch ("a*", "abc", 0) != 0); }],
++[AC_TRY_RUN([int main(void) { exit (fnmatch ("a*", "abc", 0) != 0); }],
+ ac_cv_func_fnmatch_works=yes, ac_cv_func_fnmatch_works=no,
+ ac_cv_func_fnmatch_works=no)])
+ if test $ac_cv_func_fnmatch_works = yes; then
+@@ -1083,11 +1083,11 @@ AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped,
+ #ifdef __cplusplus
+ extern "C" { void *malloc(unsigned); }
+ #else
+-char *malloc();
++char *malloc(...);
+ #endif
+ 
+ int
+-main()
++main(void)
+ {
+ 	char *data, *data2, *data3;
+ 	int i, pagesize;
+@@ -1172,7 +1172,7 @@ int     pid;
+ int     pg1, pg2, pg3, pg4;
+ int     ng, np, s, child;
+ 
+-main()
++int main(void)
+ {
+         pid = getpid();
+         pg1 = getpgrp(0);
+@@ -1228,7 +1228,7 @@ AC_TRY_RUN([
+  * If this system has a BSD-style setpgrp, which takes arguments, exit
+  * successfully.
+  */
+-main()
++int main(void)
+ {
+     if (setpgrp(1,1) == -1)
+ 	exit(0);
+@@ -1291,7 +1291,7 @@ sparc_address_test (arg) int arg;
+     }
+   }
+ }
+-main() {
++int main(void) {
+   pid_t parent = getpid ();
+   pid_t child;
+ 
+@@ -1360,7 +1360,7 @@ AC_DEFUN(AC_FUNC_WAIT3,
+ #include <sys/resource.h>
+ #include <stdio.h>
+ /* HP-UX has wait3 but does not fill in rusage at all.  */
+-main() {
++int main(void) {
+   struct rusage r;
+   int i;
+   /* Use a field that we can force nonzero --
+@@ -1416,7 +1416,7 @@ AC_CACHE_CHECK([for alloca], ac_cv_func_alloca_works,
+  #pragma alloca
+ #   else
+ #    ifndef alloca /* predefined by HP cc +Olibcalls */
+-char *alloca ();
++char *alloca (...);
+ #    endif
+ #   endif
+ #  endif
+@@ -1464,7 +1464,7 @@ AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
+   else
+     return (&dummy > addr) ? 1 : -1;
+ }
+-main ()
++int main (void)
+ {
+   exit (find_stack_direction() < 0);
+ }], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
+@@ -1582,7 +1582,7 @@ AC_DEFUN(AC_FUNC_UTIME_NULL,
+ # Sequent interprets utime(file, 0) to mean use start of epoch.  Wrong.
+ AC_TRY_RUN([#include <sys/types.h>
+ #include <sys/stat.h>
+-main() {
++int main(void) {
+ struct stat s, t;
+ exit(!(stat ("conftestdata", &s) == 0 && utime("conftestdata", (long *)0) == 0
+ && stat("conftestdata", &t) == 0 && t.st_mtime >= s.st_mtime
+@@ -1598,7 +1598,7 @@ fi
+ AC_DEFUN(AC_FUNC_STRCOLL,
+ [AC_CACHE_CHECK(for working strcoll, ac_cv_func_strcoll_works,
+ [AC_TRY_RUN([#include <string.h>
+-main ()
++int main (void)
+ {
+   exit (strcoll ("abc", "def") >= 0 ||
+ 	strcoll ("ABC", "DEF") >= 0 ||
+@@ -1615,7 +1615,7 @@ AC_DEFUN(AC_FUNC_SETVBUF_REVERSED,
+   ac_cv_func_setvbuf_reversed,
+ [AC_TRY_RUN([#include <stdio.h>
+ /* If setvbuf has the reversed format, exit 0. */
+-main () {
++int main (void) {
+   /* This call has the arguments reversed.
+      A reversed system may check and see that the address of main
+      is not _IOLBF, _IONBF, or _IOFBF, and return nonzero.  */
+@@ -1647,7 +1647,7 @@ LIBS="-lintl $LIBS"])])])
+ AC_DEFUN(AC_FUNC_MEMCMP,
+ [AC_CACHE_CHECK(for 8-bit clean memcmp, ac_cv_func_memcmp_clean,
+ [AC_TRY_RUN([
+-main()
++int main(void)
+ {
+   char c0 = 0x40, c1 = 0x80, c2 = 0x81;
+   exit(memcmp(&c0, &c2, 1) < 0 && memcmp(&c1, &c2, 1) < 0 ? 0 : 1);
+@@ -1805,7 +1805,7 @@ AC_TRY_RUN(
+ #if !defined(__STDC__) || __STDC__ != 1
+ #define volatile
+ #endif
+-main() {
++int main(void) {
+   volatile char c = 255; exit(c < 0);
+ }], ac_cv_c_char_unsigned=yes, ac_cv_c_char_unsigned=no)
+ fi])
+@@ -1819,7 +1819,7 @@ AC_DEFUN(AC_C_LONG_DOUBLE,
+ [if test "$GCC" = yes; then
+   ac_cv_c_long_double=yes
+ else
+-AC_TRY_RUN([int main() {
++AC_TRY_RUN([int main(void) {
+ /* The Stardent Vistra knows sizeof(long double), but does not support it.  */
+ long double foo = 0.0;
+ /* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
+@@ -1834,7 +1834,7 @@ fi
+ AC_DEFUN(AC_INT_16_BITS,
+ [AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(int)])dnl
+ AC_MSG_CHECKING(whether int is 16 bits)
+-AC_TRY_RUN([main() { exit(sizeof(int) != 2); }],
++AC_TRY_RUN([int main(void) { exit(sizeof(int) != 2); }],
+  [AC_MSG_RESULT(yes)
+  AC_DEFINE(INT_16_BITS)], AC_MSG_RESULT(no))
+ ])
+@@ -1842,7 +1842,7 @@ AC_TRY_RUN([main() { exit(sizeof(int) != 2); }],
+ AC_DEFUN(AC_LONG_64_BITS,
+ [AC_OBSOLETE([$0], [; instead use AC_CHECK_SIZEOF(long)])dnl
+ AC_MSG_CHECKING(whether long int is 64 bits)
+-AC_TRY_RUN([main() { exit(sizeof(long int) != 8); }],
++AC_TRY_RUN([int main(void) { exit(sizeof(long int) != 8); }],
+  [AC_MSG_RESULT(yes)
+  AC_DEFINE(LONG_64_BITS)], AC_MSG_RESULT(no))
+ ])
+@@ -1862,7 +1862,7 @@ AC_TRY_COMPILE([#include <sys/types.h>
+  not big endian
+ #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
+ if test $ac_cv_c_bigendian = unknown; then
+-AC_TRY_RUN([main () {
++AC_TRY_RUN([int main (void) {
+   /* Are we little or big endian?  From Harbison&Steele.  */
+   union
+   {
+@@ -1885,7 +1885,7 @@ AC_DEFUN(AC_C_INLINE,
+ [AC_CACHE_CHECK([for inline], ac_cv_c_inline,
+ [ac_cv_c_inline=no
+ for ac_kw in inline __inline__ __inline; do
+-  AC_TRY_COMPILE(, [} $ac_kw foo() {], [ac_cv_c_inline=$ac_kw; break])
++  AC_TRY_COMPILE(, [} $ac_kw foo(void) {], [ac_cv_c_inline=$ac_kw; break])
+ done
+ ])
+ case "$ac_cv_c_inline" in
+@@ -2277,7 +2277,7 @@ AC_DEFUN(AC_SYS_RESTARTABLE_SYSCALLS,
+ #include <sys/types.h>
+ #include <signal.h>
+ ucatch (isig) { }
+-main () {
++int main (void) {
+   int i = fork (), status;
+   if (i == 0) { sleep (3); kill (getppid (), SIGINT); sleep (3); exit (0); }
+   signal (SIGINT, ucatch);
+@@ -2654,7 +2654,7 @@ AC_CACHE_VAL(ac_cv_exeext,
+   ac_cv_exeext=.exe
+ else
+   rm -f conftest*
+-  echo 'int main () { return 0; }' > conftest.$ac_ext
++  echo 'int main (void) { return 0; }' > conftest.$ac_ext
+   ac_cv_exeext=
+   if AC_TRY_EVAL(ac_link); then
+     for file in conftest.*; do

autoconf2.13/autoconf-2.13-perl-5.26.patch

@@ -0,0 +1,12 @@
+diff -ruN autoconf-2.13.orig/autoscan.pl autoconf-2.13/autoscan.pl
+--- autoconf-2.13.orig/autoscan.pl	1999-01-05 14:28:42.000000000 +0100
++++ autoconf-2.13/autoscan.pl	2018-12-22 19:55:10.986732296 +0100
+@@ -232,7 +232,7 @@
+ 	# Strip out comments and variable references.
+ 	s/#.*//;
+ 	s/\$\([^\)]*\)//g;
+-	s/\${[^\}]*}//g;
++	s/\$\{[^\}]*}//g;
+ 	s/@[^@]*@//g;
+ 
+ 	# Variable assignments.

autoconf2.13/autoconf-2.13-test-fixes.patch

@@ -0,0 +1,18 @@
+newer gcc versions don't provide g77, so if it doesn't exist,
+don't bother trying to test it (and failing)
+
+http://bugs.gentoo.org/146592
+
+--- autoconf-2.13/testsuite/autoconf.s/syntax.exp
++++ autoconf-2.13/testsuite/autoconf.s/syntax.exp
+@@ -5,6 +5,10 @@
+ set macros [exec sed -n $script $srcdir/../acspecific.m4]
+ 
+ foreach mac $macros {
++    if { [string match "*F77*" "$mac"] && [catch {exec which g77} ignore_output] } then {
++        send_user "XFAIL: $mac\n"
++        continue
++    }
+     send_user "$mac\n"
+     autoconf_test $mac $mac
+ }