Index: Makefile
===================================================================
--- Makefile	(revision 481408)
+++ Makefile	(working copy)
@@ -13,8 +13,6 @@
 LICENSE=	BSD3CLAUSE LGPL3 GPLv3
 LICENSE_COMB=	multi
 
-BROKEN_powerpc64=	fails to build: requires 'c++14-lang' in USES (cf.)
-
 BUILD_DEPENDS=	boost-libs>0:devel/boost-libs
 
 USES=		cmake:outsource compiler:openmp # once #199603 is resolved, add c++14-lang
@@ -40,4 +38,8 @@
 PLIST_SUB+=	RM_I386=""
 .endif
 
++.if ${ARCH:Mmips*} || ${ARCH:Mpowerpc*} || ${ARCH} == sparc64
+USE_GCC=	yes
+.endif
+
 .include <bsd.port.post.mk>