[gnome-control-center] printers: Check that cups-config exists

[Bastien Nocera <hadess src gnome org>]

commit c2987d8cdee89be5209b1bc4c8af108bcb0f7dcb
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Aug 17 17:47:43 2012 +0100

    printers: Check that cups-config exists
    
    Before using it.

 configure.ac |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 1e2fde6..517718e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -186,8 +186,11 @@ AC_ARG_ENABLE([cups],
 if test x"$enable_cups" != x"no" ; then
   AC_PROG_SED
 
-  AC_PATH_PROG(CUPS_CONFIG, cups-config,
-               AC_MSG_ERROR([cups-config not found but CUPS support requested]))
+  AC_PATH_PROG(CUPS_CONFIG, cups-config)
+
+  if test x$CUPS_CONFIG = x; then
+    AC_MSG_ERROR([cups-config not found but CUPS support requested])
+  fi
 
   CUPS_API_VERSION=`$CUPS_CONFIG --api-version`
   CUPS_API_MAJOR=`echo $ECHO_N $CUPS_API_VERSION | cut -d . -f 1`