[gtk+] If --enable-colord or --disable-colord is not used when configuring, autodetect the presence of colo

[Richard Hughes <rhughes src gnome org>]

commit 7a328b377c50a0ba527a497010216f42aec31b91
Author: Richard Hughes <richard hughsie com>
Date:   Fri Jun 10 12:34:40 2011 +0100

    If --enable-colord or --disable-colord is not used when configuring, autodetect the presence of colord

 configure.ac |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 77a6cee..22943e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1543,14 +1543,21 @@ AC_ARG_ENABLE(colord,
 have_colord=no
 if test "x$enable_colord" != "xno"; then
         if test "os_win32" != "yes"; then
-                PKG_CHECK_MODULES(COLORD, colord >= 0.1.9)
-                have_colord=yes
-                AC_DEFINE(HAVE_COLORD, 1, [define if we have colord])
+                PKG_CHECK_MODULES(COLORD, colord >= 0.1.9,
+                                  have_colord=yes, have_colord=no)
+                if test "enable_colord" = "yes"; then
+                        if test "have_colord" = "no"; then
+                                AC_MSG_ERROR([--enable-colord specified, but not available])
+                        fi
+                fi
         else
                 AC_MSG_ERROR([colord support is not available on win32])
         fi
 fi
 
+if test "have_colord" = "yes"; then
+        AC_DEFINE(HAVE_COLORD, 1, [define if we have colord])
+fi
 AM_CONDITIONAL(HAVE_COLORD, test "x$have_colord" = "xyes")
 
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