Index: head/graphics/gsculpt/Makefile
===================================================================
--- head/graphics/gsculpt/Makefile
+++ head/graphics/gsculpt/Makefile
@@ -24,7 +24,7 @@
 
 WRKSRC=		${WRKDIR}/${DISTNAME:S,-src,,}
 
-USES=		pkgconfig python:2.7 scons
+USES=		compiler:c++11-lang pkgconfig python:2.7 scons
 USE_GNOME=	pygtk2
 USE_GL=		glu
 USE_XORG=	x11
Index: head/graphics/gsculpt/files/patch-cpp_extlibs_greenlet_slp__platformselect.h
===================================================================
--- head/graphics/gsculpt/files/patch-cpp_extlibs_greenlet_slp__platformselect.h
+++ head/graphics/gsculpt/files/patch-cpp_extlibs_greenlet_slp__platformselect.h
@@ -0,0 +1,11 @@
+--- cpp/extlibs/greenlet/slp_platformselect.h.orig	2019-07-26 21:28:17 UTC
++++ cpp/extlibs/greenlet/slp_platformselect.h
+@@ -8,7 +8,7 @@
+ #include "switch_amd64_unix.h" /* gcc on amd64 */
+ #elif defined(__GNUC__) && defined(__i386__)
+ #include "switch_x86_unix.h" /* gcc on X86 */
+-#elif defined(__GNUC__) && defined(__PPC__) && defined(__linux__)
++#elif defined(__GNUC__) && defined(__PPC__) && !defined(__APPLE__)
+ #include "switch_ppc_unix.h" /* gcc on PowerPC */
+ #elif defined(__GNUC__) && defined(__ppc__) && defined(__APPLE__)
+ #include "switch_ppc_macosx.h" /* Apple MacOS X on PowerPC */