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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 6844f6cb..d822dd2b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -259,7 +259,7 @@ PKG_CHECK_MODULES([X11], [x11 xproto],
have_keysymdef_h=no
AC_CHECK_HEADER([X11/keysymdef.h],
[AC_MSG_CHECKING([for X11/keysymdef.h absolute location])
- AC_PREPROC_IFELSE([#include <X11/keysymdef.h>],
+ AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <X11/keysymdef.h>]])],
[[X11_KEYSYMDEF_H=`$SED -n 's%^[^"]*"\([^"]*X11/keysymdef.h\)".*$%\1%p' conftest.i`]
# did the sed magic above work?
AS_IF([test -f "$X11_KEYSYMDEF_H"],