From cadb4ac730bd1ebd264b27e95086596cd3afd889 Mon Sep 17 00:00:00 2001
From: Horst3180
Date: Mon, 26 Oct 2015 16:14:42 +0100
Subject: better error handling

---
 m4/arc-gnome.m4 | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/m4/arc-gnome.m4 b/m4/arc-gnome.m4
index 82bd510..f247b8a 100644
--- a/m4/arc-gnome.m4
+++ b/m4/arc-gnome.m4
@@ -3,18 +3,25 @@
 AC_DEFUN([ARC_GNOME], [
     GNOMEDIR="$srcdir/common/gtk-3.0"
 
-    PKG_CHECK_EXISTS(
-        [gtk+-3.0],
-        [GNOME_VERSION=`$PKG_CONFIG --modversion gtk+-3.0`],
-        [GNOME_VERSION=`ls -1 "$GNOMEDIR" | tail -1`]
-    )
     AC_ARG_WITH(
         [gnome],
         [AS_HELP_STRING(
             [--with-gnome],
             [GNOME minor version]
         )],
-        [GNOME_VERSION="$withval"]
+        [GNOME_VERSION="$withval"],
+        [
+         AC_CHECK_PROG(HAVE_PKG_CONFIG, pkg-config, yes)
+         AS_IF(
+             [test "x$HAVE_PKG_CONFIG" != "xyes"],
+             [AC_MSG_ERROR([Could not find pkg-config.])]
+         )
+         PKG_CHECK_EXISTS(
+            [gtk+-3.0],
+            [GNOME_VERSION=`$PKG_CONFIG --modversion gtk+-3.0`],
+            [AC_MSG_ERROR([Could not determine GNOME version. Please install GTK+3.0 and/or GTK+3.0 development files.])]
+          )
+        ]
     )
 
     # Trim version extras
@@ -31,7 +38,8 @@ AC_DEFUN([ARC_GNOME], [
     )
     AS_IF(
         [! test -e "$GNOMEDIR/$GNOME_VERSION"],
-        [AC_MSG_ERROR([invalid GNOME version: $GNOME_VERSION])]
+        [AC_MSG_ERROR([Invalid GNOME version: $GNOME_VERSION])]
     )
     AC_SUBST([GNOME_VERSION])
+    AC_MSG_RESULT([Building for GNOME $GNOME_VERSION])
 ])
-- 
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