--- tcsh-6.18.01/config.guess.orig	2011-12-28 06:20:03.000000000 +0900
+++ tcsh-6.18.01/config.guess	2014-08-15 16:12:29.397342600 +0900
@@ -801,6 +801,9 @@
     i*:CYGWIN*:*)
 	echo ${UNAME_MACHINE}-pc-cygwin
 	exit ;;
+    *:MSYS*:*)
+	echo ${UNAME_MACHINE}-pc-msys
+	exit ;;
     *:MINGW*:*)
 	echo ${UNAME_MACHINE}-pc-mingw32
 	exit ;;
--- tcsh-6.18.01/config.rpath.orig	2008-08-30 16:56:27.000000000 +0900
+++ tcsh-6.18.01/config.rpath	2014-08-15 16:24:49.628258600 +0900
@@ -112,7 +112,7 @@
 hardcode_minus_L=no
 
 case "$host_os" in
-  cygwin* | mingw* | pw32*)
+  cygwin* | msys* | mingw* | pw32*)
     # FIXME: the MSVC++ port hasn't been tested in a loooong time
     # When not using gcc, we currently assume that we are using
     # Microsoft Visual C++.
@@ -152,7 +152,7 @@
         ld_shlibs=no
       fi
       ;;
-    cygwin* | mingw* | pw32*)
+    cygwin* | msys* | mingw* | pw32*)
       # hardcode_libdir_flag_spec is actually meaningless, as there is
       # no search path for DLLs.
       hardcode_libdir_flag_spec='-L$libdir'
@@ -278,7 +278,7 @@
       ;;
     bsdi[45]*)
       ;;
-    cygwin* | mingw* | pw32*)
+    cygwin* | msys* | mingw* | pw32*)
       # When not using gcc, we currently assume that we are using
       # Microsoft Visual C++.
       # hardcode_libdir_flag_spec is actually meaningless, as there is
@@ -459,7 +459,7 @@
     ;;
   bsdi[45]*)
     ;;
-  cygwin* | mingw* | pw32*)
+  cygwin* | msys* | mingw* | pw32*)
     shrext=.dll
     ;;
   darwin* | rhapsody*)
--- tcsh-6.18.01/configure.ac.orig	2012-02-14 01:33:50.000000000 +0900
+++ tcsh-6.18.01/configure.ac	2014-08-15 16:28:40.326872700 +0900
@@ -239,6 +239,11 @@
     tcsh_config_file=cray
   ;;
 
+  ## Minimal System
+  *-msys)
+    tcsh_config_file=msys
+  ;;
+
   ## Red Hat Cygwin
   *-cygwin)
     tcsh_config_file=cygwin