[gnome-builder] libidemm: fix autotools check for gtkmm

[Christian Hergert <chergert src gnome org>]

commit f04a8fea6a93774032b52e83228448ed6d91fb73
Author: Felix Schwarz <felix schwarz oss schwarz eu>
Date:   Mon Dec 12 10:52:00 2016 +0000

    libidemm: fix autotools check for gtkmm
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775975

 libidemm/configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libidemm/configure.ac b/libidemm/configure.ac
index f25c8b5..700eec1 100644
--- a/libidemm/configure.ac
+++ b/libidemm/configure.ac
@@ -26,7 +26,7 @@ AS_IF([test x$enable_idemm != xno],[
                          [have_gtkmm=yes],
                          [have_gtkmm=no])
 
-        AS_IF([test x$enable_idemm = xyes && test x$have_idemm = xno],[
+        AS_IF([test x$enable_idemm = xyes && test x$have_gtkmm = xno],[
                AC_MSG_ERROR([--enable-idemm requires gtkmm >= gtkmm_required_version])
        ])