games/tome4: fix build on powerpc

Force GCC:
In file included from ../src/luajit2/src/host/buildvm_lib.c:6:
In file included from ../src/luajit2/src/host/buildvm.h:16:
../src/luajit2/src/lj_arch.h:295:2: error: "Need at least GCC 4.3 or newer"

games/tome4/Makefile

@@ -18,10 +18,9 @@ BUILD_DEPENDS=	premake4:devel/premake4
 LIB_DEPENDS=	libvorbisfile.so:audio/libvorbis \
 		libpng.so:graphics/png
 
-USES=		compiler:c++11-lang gl gmake openal:al sdl tar:bzip2 xorg
+USES=		gl gmake openal:al sdl tar:bzip2 xorg
 USE_SDL=	image2 sdl2 ttf2
 USE_GL=		gl glu
-USE_CSTD=	gnu89
 SUB_FILES=	tome4
 
 MAKE_JOBS_UNSAFE=	yes
@@ -34,7 +33,13 @@ WRKSRC=		${WRKDIR}/t-engine4-src-${DISTVERSION}
 MAKE_ARGS+=	config=release verbose=yes ARCH="" CC=${CC} CXX=${CXX}
 LDFLAGS_i386=	-Wl,-znotext
 
-.include <bsd.port.pre.mk>
+.include <bsd.port.options.mk>
+
+.if ${ARCH} == powerpc
+USES+=		compiler:gcc-c++11-lib
+.else
+USES+=		compiler:c++11-lang
+.endif
 
 pre-build:
 	@${REINPLACE_CMD} 's|%%LOCALBASE%%|${LOCALBASE}|' ${WRKSRC}/premake4.lua
@@ -55,4 +60,4 @@ do-install:
 	${INSTALL_DATA} ${_DISTDIR}/${PORTNAME}.png \
 		${STAGEDIR}${PREFIX}/share/pixmaps
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>