Index: head/math/py-piranha/Makefile
===================================================================
--- head/math/py-piranha/Makefile	(revision 568377)
+++ head/math/py-piranha/Makefile	(revision 568378)
@@ -1,46 +1,46 @@
 # $FreeBSD$
 
 PORTNAME=	piranha
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.11
 PORTREVISION=	7
 CATEGORIES=	math
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Python binding for Piranha, the computer algebra system
 
 LICENSE=	GPLv3 LGPL3
 LICENSE_COMB=	dual
 LICENSE_FILE_GPLv3=	${WRKSRC}/COPYING.gpl3
 LICENSE_FILE_LGPL3=	${WRKSRC}/COPYING.lgpl3
 
 BUILD_DEPENDS=	${LOCALBASE}/include/piranha/piranha.hpp:math/${PORTNAME}
 LIB_DEPENDS=	libboost_iostreams.so:devel/boost-libs \
 		libgmp.so:math/gmp \
 		libmpfr.so:math/mpfr \
 		${PY_BOOST}
 
 USES=		cmake compiler:c++14-lang python:3.6+
 USE_GITHUB=	yes
 GH_ACCOUNT=	bluescarni
 USE_PYTHON=	flavors
 
-PYTHON_SUFFIX_LETTER=	${PYTHON_VER:C/^2.*//:C/^3.*/m/}
+PYTHON_SUFFIX_LETTER=	${PYTHON_VER:C/^3.[67]/m/:C/^3.[89]//}
 
 CMAKE_ON=	BUILD_PYRANHA
 CMAKE_OFF=	PIRANHA_INSTALL_HEADERS
 CMAKE_ARGS=	-DPYTHON_EXECUTABLE:STRING=${PYTHON_CMD} \
 		-DPYTHON_LIBRARIES:STRING=${LOCALBASE}/lib/libpython${PYTHON_VER}${PYTHON_SUFFIX_LETTER}.so \
 		-DPYTHON_INCLUDE_DIRS:STRING=${LOCALBASE}/include/python${PYTHON_VER}${PYTHON_SUFFIX_LETTER} \
 		-DPYTHONLIBS_VERSION_STRING:STRING=${PYTHON_VER} \
 		-DPYTHON_VERSION_MAJOR:STRING=${PYTHON_MAJOR_VER} \
 		-DPYTHON_VERSION_MINOR:STRING=${PYTHON_VER:C/[0-9]\.//}
 
 post-patch: # FIND_PACKAGE(Boost) only supports modules python and python3
 	@${REINPLACE_CMD} -e 's|$${REQUIRED_BOOST_LIBS} python)|$${REQUIRED_BOOST_LIBS} python${PYTHON_MAJOR_VER:S/2//})|' ${WRKSRC}/CMakeLists.txt
 
 post-install:
 	@${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/pyranha/_core*.so
 
 .include <bsd.port.mk>