configure.ac: Use automake color-tests
diff --git a/configure.ac b/configure.ac
index d207ebb..682e7a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@
 
 AC_CONFIG_HEADERS([config.h])
 
-AM_INIT_AUTOMAKE([1.11 parallel-tests foreign no-dist-gzip dist-xz])
+AM_INIT_AUTOMAKE([1.11 parallel-tests foreign no-dist-gzip dist-xz color-tests])
 
 AM_SILENT_RULES([yes])