[gimp/soc-2011-gimpunitentry] libgimpwidgets: fix for the last commit

[Enrico Schröder <eschroeder src gnome org>]

commit 4c2f1c18ec8d86c9d70e724228320a8ace31b118
Author: Enrico SchroÌ?der <enni schroeder gmail com>
Date:   Mon Jun 13 14:59:48 2011 +0200

    libgimpwidgets: fix for the last commit

 libgimpwidgets/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgimpwidgets/Makefile.am b/libgimpwidgets/Makefile.am
index ba6d288..09263b3 100644
--- a/libgimpwidgets/Makefile.am
+++ b/libgimpwidgets/Makefile.am
@@ -48,7 +48,7 @@ endif
 
 # Run tests with xvfb-run if available
 if HAVE_XVFB_RUN
-TESTS_ENVIRONMENT += $(XVFB_RUN) --server-args="-screen 0 1280x1024x24"
+TESTS_ENVIRONMENT = $(XVFB_RUN) --server-args="-screen 0 1280x1024x24"
 endif
 
 libgimpwidgetsincludedir = $(includedir)/gimp-$(GIMP_API_VERSION)/libgimpwidgets