diff --git a/make.conf.backbone b/make.conf.backbone
index 556c917..89ccb93 100644
--- a/make.conf.backbone
+++ b/make.conf.backbone
@@ -52,4 +52,4 @@ RUBY_TARGETS="ruby18"
 USE="mmx mmxext 3dnow sse sse2 custom-cflags fftw alsa unicode bash-completion threads vaapi daemon xattr \
      -X -qt4 -gtk -kde -gnome \
      -cups -debug -python -perl -oss -static-libs \
-     -cairo"
+     -cairo -acl"