diff --git a/configure.ac b/configure.ac
index 9e04ff015..887dae571 100644
--- a/configure.ac
+++ b/configure.ac
@@ -726,9 +726,9 @@ case $host_os in
 		 		save_LDFLAGS=$LDFLAGS
 				LDFLAGS="$LDFLAGS -framework Carbon"
 				AC_LINK_IFELSE([char FSFindFolder(); int main() { FSFindFolder(); return 0;}],
-				[xorg_cv_Carbon_framework=yes],
-				[xorg_cv_Carbon_framework=no])
-			LDFLAGS=$save_LDFLAGS])
+				               [xorg_cv_Carbon_framework=yes],
+				               [xorg_cv_Carbon_framework=no])
+			        LDFLAGS=$save_LDFLAGS])
                 
 			if test "X$xorg_cv_Carbon_framework" = Xyes; then
 				XQUARTZ=yes
@@ -737,6 +737,10 @@ case $host_os in
 			fi
 		fi
 
+		AC_CHECK_FUNC(dispatch_async,
+		              AC_DEFINE([HAVE_LIBDISPATCH], 1, [Define to 1 if you have the libdispatch (GCD) available]),
+		              [])
+
 		if test "x$XQUARTZ" = xyes ; then
 			XQUARTZ=yes
 			XVFB=no
diff --git a/include/dix-config.h.in b/include/dix-config.h.in
index fd9ecced2..14229b435 100644
--- a/include/dix-config.h.in
+++ b/include/dix-config.h.in
@@ -136,6 +136,9 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the libdispatch (GCD) available */
+#undef HAVE_LIBDISPATCH
+
 /* Define to 1 if you have the `link' function. */
 #undef HAVE_LINK