Index: Makefile
===================================================================
--- Makefile	(revision 480254)
+++ Makefile	(working copy)
@@ -30,13 +30,17 @@
 QMAKESPEC=	freebsd-${QMAKE_COMPILER}
 INSTALL_TARGET=	sub-qmake-qmake-aux-pro-install_subtargets install_mkspecs
 
-BROKEN_powerpc64=	fails to compile: error: unrecognized command line option -std=c++11
-
 BUILD_WRKSRC=	${WRKSRC}/${PORTNAME}
 
+.include <bsd.port.pre.mk>
+
 post-patch:
 # Clean up files created by patching
 	@${RM} ${WRKSRC}/mkspecs/*/*.orig
+.if ${ARCH} == sparc64 || ${ARCH} == mips64 || ${ARCH:Mpowerpc*}
+EXTRA_PATCHES=	${PATCHDIR}/extra-patch-mkspecs_common_g++-base.conf \
+		${PATCHDIR}/extra-patch-mkspecs_common_gcc-base.conf
+.endif
 
 post-build:
 # Complete configure stage to generate *.pri files.
@@ -45,4 +49,4 @@
 		CXXFLAGS="${CXXFLAGS}" LDFLAGS="${LDFLAGS}" BUILD_QMAKE=1 \
 		${CONFIGURE_ENV} ${CONFIGURE_CMD} ${CONFIGURE_ARGS}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: files/extra-patch-mkspecs_common_g++-base.conf
===================================================================
--- files/extra-patch-mkspecs_common_g++-base.conf	(nonexistent)
+++ files/extra-patch-mkspecs_common_g++-base.conf	(working copy)
@@ -0,0 +1,20 @@
+--- mkspecs/common/g++-base.conf.orig	2018-09-21 12:02:35 UTC
++++ mkspecs/common/g++-base.conf
+@@ -8,14 +8,14 @@
+ # you can use the manual test in tests/manual/mkspecs.
+ #
+ 
+-QMAKE_COMPILER          = gcc
++QMAKE_COMPILER          = gcc7
+ 
+-QMAKE_CC                = gcc
++QMAKE_CC                = gcc7
+ 
+ QMAKE_LINK_C            = $$QMAKE_CC
+ QMAKE_LINK_C_SHLIB      = $$QMAKE_CC
+ 
+-QMAKE_CXX               = g++
++QMAKE_CXX               = g++7
+ 
+ QMAKE_LINK              = $$QMAKE_CXX
+ QMAKE_LINK_SHLIB        = $$QMAKE_CXX

Property changes on: files/extra-patch-mkspecs_common_g++-base.conf
___________________________________________________________________
Added: fbsd:nokeywords
## -0,0 +1 ##
+yes
\ No newline at end of property
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property
Index: files/extra-patch-mkspecs_common_gcc-base.conf
===================================================================
--- files/extra-patch-mkspecs_common_gcc-base.conf	(nonexistent)
+++ files/extra-patch-mkspecs_common_gcc-base.conf	(working copy)
@@ -0,0 +1,11 @@
+--- mkspecs/common/gcc-base.conf.orig	2018-09-21 12:20:28 UTC
++++ mkspecs/common/gcc-base.conf
+@@ -73,7 +73,7 @@ QMAKE_CXXFLAGS_LTCG        = $$QMAKE_CFLAGS_LTCG
+ QMAKE_CXXFLAGS_LTCG_FATOBJECTS = $$QMAKE_CFLAGS_LTCG_FATOBJECTS
+ QMAKE_CXXFLAGS_DISABLE_LTCG   = $$QMAKE_CFLAGS_DISABLE_LTCG
+ 
+-QMAKE_LFLAGS           +=
++QMAKE_LFLAGS           += -Wl,-rpath=/usr/local/lib/gcc7
+ QMAKE_LFLAGS_DEBUG     +=
+ QMAKE_LFLAGS_APP       +=
+ QMAKE_LFLAGS_RELEASE   +=

Property changes on: files/extra-patch-mkspecs_common_gcc-base.conf
___________________________________________________________________
Added: fbsd:nokeywords
## -0,0 +1 ##
+yes
\ No newline at end of property
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property