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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 5317a4be1..c3270fec4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -538,7 +538,7 @@ if test "x$with_x" != "xno"; then
ac_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $X_CFLAGS"
AC_CHECK_HEADERS([X11/extensions/XShm.h], [true],
- [AC_MSG_ERROR([XShm extension is required])])
+ [AC_MSG_ERROR([XShm extension is required])], [[#include <X11/Xlib.h>]])
AC_CHECK_LIB([Xext], [main], [true],
[AC_MSG_ERROR([libXext is required])], [$X_LIBS])
CPPFLAGS="$ac_save_CPPFLAGS"