Patch by Yaakov Selkowitz

---
 macros/xorg-macros.m4.in |    4 ++++
 1 file changed, 4 insertions(+)

Index: xorg-git/macros/xorg-macros.m4.in
===================================================================
--- xorg-git.orig/macros/xorg-macros.m4.in
+++ xorg-git/macros/xorg-macros.m4.in
@@ -79,6 +79,10 @@ else
        if test `${RAWCPP} -undef < conftest.$ac_ext | grep -c 'unix'` -eq 1 ; 
then
                RAWCPPFLAGS=-undef
                AC_MSG_RESULT([yes])
+       # under Cygwin unix is still defined even with -undef
+       elif test `${RAWCPP} -undef -ansi < conftest.$ac_ext | grep -c 'unix'` 
-eq 1 ; then
+               RAWCPPFLAGS="-undef -ansi"
+               AC_MSG_RESULT([yes, with -ansi])
        else
                AC_MSG_ERROR([${RAWCPP} defines unix with or without -undef.  I 
don't know what to do.])
        fi

-- 
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