diff --git a/buildsys.mk.in b/buildsys.mk.in
index 57a2366..7c89291 100644
--- a/buildsys.mk.in
+++ b/buildsys.mk.in
@@ -35,6 +35,7 @@ ERLCFLAGS = @ERLCFLAGS@
 OBJCFLAGS = @OBJCFLAGS@
 LDFLAGS = @LDFLAGS@
 LIBS = @LIBS@
+PROG_SUFFIX = @PROG_SUFFIX@
 LIB_CPPFLAGS = @LIB_CPPFLAGS@
 LIB_CFLAGS = @LIB_CFLAGS@
 LIB_LDFLAGS = @LIB_LDFLAGS@