Created attachment 204083 [details] patch Add USES=compiler:c++14-lang to fix build on GCC architectures. Tested on powerpc64 and amd64.
LGTM.
A commit references this bug: Author: pkubaj Date: Tue Apr 30 14:29:21 UTC 2019 New revision: 500497 URL: https://svnweb.freebsd.org/changeset/ports/500497 Log: security/klee: fix build with GCC-based architectures Add USES=compiler:c++14-lang to fix build on GCC architectures: Make Error in lib/Basic/CMakeLists.txt: Target "kleeBasic" requires the language dialect "CXX14" (with compiler extensions), but CMake does not know the compile flags to use to enable it. PR: 237623 Approved by: arrowd (maintainer), mat (mentor) Differential Revision: https://reviews.freebsd.org/D20088 Changes: head/security/klee/Makefile