diff --git a/math/planarity/Makefile b/math/planarity/Makefile
index 02d127715ef8..fb45b5ab332c 100644
--- a/math/planarity/Makefile
+++ b/math/planarity/Makefile
@@ -14,7 +14,7 @@ USE_GITHUB=	yes
 GH_ACCOUNT=	graph-algorithms
 GH_PROJECT=	edge-addition-planarity-suite
 
-USES=		autoreconf libtool
+USES=		autoreconf libtool pkgconfig
 
 GNU_CONFIGURE=	yes
 GNU_CONFIGURE_MANPREFIX=${PREFIX}/share