[epiphany] configure.ac: gdbus-codegen is required

[Xan Lopez <xan src gnome org>]

commit 8cfcb6905f4c4dca488987f22a847dd1283b39ac
Author: Xan Lopez <xlopez igalia com>
Date:   Tue Sep 6 15:28:22 2011 +0200

    configure.ac: gdbus-codegen is required
    
    Fail if it's not found. Apparently gentoo ships this independently of
    glib, so it can happen.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=657610

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 28eb038..2e3fa57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -292,7 +292,7 @@ fi
 AM_CONDITIONAL([ENABLE_ZEROCONF],[test "$enable_zeroconf" = "yes"])
 
 # GDBus codegen
-AC_PATH_PROG([GDBUS_CODEGEN], [gdbus-codegen])
+AC_PATH_PROG([GDBUS_CODEGEN], [gdbus-codegen], AC_MSG_ERROR([gdbus-codegen is required but was not found]))
 
 # ************
 # Misc defines