Index: Makefile
===================================================================
--- Makefile	(revision 481243)
+++ Makefile	(working copy)
@@ -8,7 +8,7 @@
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Qt 5-compatible OpenGL support module
 
-USES=		qmake:no_env qt-dist:5,base
+USES=		compiler:c++17-lang gl qmake:no_env qt-dist:5,base
 USE_GL=		gl
 USE_QT=		core gui widgets qmake_build buildtools_build
 HAS_CONFIGURE=	yes