--- Makefile	2017-10-29 22:55:31.307529000 +0100
+++ Makefile	2017-11-03 00:10:17.838711000 +0100
@@ -23,7 +23,7 @@ 
 
 EMACS_VER=	25.3
 GNU_CONFIGURE=	yes
-USES=		cpe gmake makeinfo ncurses pkgconfig tar:xz
+USES=		compiler:openmp cpe gmake makeinfo ncurses pkgconfig tar:xz
 # Building with GCC 4.6+ requires it; remove after 9.3 EOL
 LDFLAGS+=	${ncurses_ARGS:Mport:C/.+/-ltinfo/}
 INFO_PATH=	${DATADIR_REL}/info