Add noreturn attribute to Syntax function

Suggested by clang:
xgamma.c:48:1: warning: function 'Syntax' could be declared with attribute
      'noreturn' [-Wmissing-noreturn]
{

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 6f79b2f..4ee5820 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,7 @@ XORG_MACROS_VERSION(1.8)
 XORG_DEFAULT_OPTIONS
 
 # Checks for pkg-config packages
-PKG_CHECK_MODULES(XGAMMA, x11 xxf86vm)
+PKG_CHECK_MODULES(XGAMMA, [x11 xxf86vm xproto >= 7.0.17])
 
 AC_CONFIG_FILES([
 	Makefile
diff --git a/xgamma.c b/xgamma.c
index a9d2c3f..6db07ef 100644
--- a/xgamma.c
+++ b/xgamma.c
@@ -43,7 +43,7 @@ static int EventBase, ErrorBase;
 #define GAMMA_MIN 0.1
 #define GAMMA_MAX 10.0
 
-static void 
+static void _X_NORETURN
 Syntax(void)
 {
     fprintf (stderr, "usage:  %s [-options]\n\n",