Index: head/science/massxpert/Makefile
===================================================================
--- head/science/massxpert/Makefile
+++ head/science/massxpert/Makefile
@@ -23,7 +23,7 @@
 GL_SITE=	https://salsa.debian.org/
 GL_ACCOUNT=	debichem-team
 GL_COMMIT=	c229f4a1abde3c20b83a90e50f9c5d79104dfa5f
-USE_GCC=	any # build breaks in clang
+USE_GCC=	yes # build breaks in clang
 USE_XORG=	ice sm x11 xau xcb xdmcp xext xrender
 USE_GNOME=	glib20
 USE_QT=		core gui svg xml widgets buildtools_build qmake_build