--- b/devel/py-sip/Makefile	
+++ b/devel/py-sip/Makefile	
@@ -15,11 +15,9 @@ COMMENT=	Python to C and C++ bindings generator
 
 USES=		python pyqt:sip
 USE_PYTHON=	concurrent py3kplist flavors
-USE_PYQT=	#
 
 CONFIGURE_ARGS=	-b ${PREFIX}/bin -d ${PYTHONPREFIX_SITELIBDIR} \
-		-e ${PYTHONPREFIX_INCLUDEDIR} -v ${DATADIR} \
-		--sipdir ${PYQT_SIPDIR} \
+		-e ${PYTHONPREFIX_INCLUDEDIR} \
 		CC="${CC}" CXX="${CXX}" LINK="${CXX}" LINK_SHLIB="${CXX}" \
 		CFLAGS="${CFLAGS}" CXXFLAGS="${CXXFLAGS}" \
 		INCDIR="${LOCALBASE}/include" LIBDIR="${LOCALBASE}/lib"
@@ -38,22 +36,33 @@ CONFIGURE_WRKSRC=	${WRKSRC}/default
 BUILD_WRKSRC=		${CONFIGURE_WRKSRC}
 INSTALL_WRKSRC=		${CONFIGURE_WRKSRC}
 
+# pyqt.mk does not know whether we uses Qt 4 or 5 in this port.
+# Therefore the following line is not well-defined:
+#   _VERSION_SUBDIR_REL=├→→→PyQt${_PYQT_VERSION}/${PYTHON_VER}
+.for version in 4 5
+_VERSION_SUBDIR_REL${version}=	share/PyQt${version}/${PYTHON_VER}/sip
+SIPDIR${version}=	${PREFIX}/${_VERSION_SUBDIR_REL${version}}
+.endfor
+
 do-configure:
 	# The default sip 'flavor'
 	${MKDIR} ${CONFIGURE_WRKSRC} &&  \
 		cd ${CONFIGURE_WRKSRC} && \
-		${PYTHON_CMD} ${WRKSRC}/configure.py ${CONFIGURE_ARGS} && \
+		${PYTHON_CMD} ${WRKSRC}/configure.py ${CONFIGURE_ARGS} --sipdir ${SIPDIR4} && \
 		${REINPLACE_CMD} -e '/sip_bin.:/s|'\'',$$|-${PYTHON_VER}'\'',|'  ${CONFIGURE_WRKSRC}/sipconfig.py
 	# The now needed version for 5.11 (which will be the default from 2019-03-16).
 	${MKDIR} ${WRKSRC}/sip_qt5 && \
 		cd ${WRKSRC}/sip_qt5 && \
-		${PYTHON_CMD} ${WRKSRC}/configure.py ${CONFIGURE_ARGS} --sip-module PyQt5.sip --no-tools  && \
+		${PYTHON_CMD} ${WRKSRC}/configure.py ${CONFIGURE_ARGS} --sipdir ${SIPDIR5} --sip-module PyQt5.sip --no-tools  && \
 		${REINPLACE_CMD} -e '/sip_bin.:/s|'\'',$$|-${PYTHON_VER}'\'',|'  ${WRKSRC}/sip_qt5/sipconfig.py
 
 post-build:
 	cd ${WRKSRC}/sip_qt5 && ${SETENV} ${MAKE_ENV} ${MAKE_CMD} ${MAKE_ARGS}
 
 post-install:
+	# The default version is PyQt4, but we need PyQt5 by default
+	${REINPLACE_CMD} -e 's/PyQt4/PyQt5/g' ${STAGEDIR}${PYTHON_SITELIBDIR}/sipconfig.py
+
 	${MKDIR} ${STAGEDIR}${DOCSDIR} && cd ${WRKSRC}/doc/html && \
 		${COPYTREE_SHARE} \. ${STAGEDIR}${DOCSDIR}
 	${PYTHON_CMD} ${PYTHON_LIBDIR}/compileall.py \