Add hhea-table support
diff --git a/src/Makefile.am b/src/Makefile.am
index 4ce5665..00f0101 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -32,6 +32,7 @@
 	hb-ot-tag.cc \
 	hb-private.hh \
 	hb-shape.cc \
+	hb-tt-font.cc \
 	hb-unicode-private.hh \
 	hb-unicode.cc \
 	$(NULL)