--- old/make/autoconf/spec.gmk.in	2020-07-31 10:28:46.832861364 -0700
+++ new/make/autoconf/spec.gmk.in	2020-07-31 10:28:46.608861367 -0700
@@ -824,6 +824,10 @@
 LCMS_CFLAGS:=@LCMS_CFLAGS@
 LCMS_LIBS:=@LCMS_LIBS@
 
+USE_EXTERNAL_HARFBUZZ:=@USE_EXTERNAL_HARFBUZZ@
+HARFBUZZ_CFLAGS:=@HARFBUZZ_CFLAGS@
+HARFBUZZ_LIBS:=@HARFBUZZ_LIBS@
+
 USE_EXTERNAL_LIBPNG:=@USE_EXTERNAL_LIBPNG@
 PNG_LIBS:=@PNG_LIBS@
 PNG_CFLAGS:=@PNG_CFLAGS@