Created attachment 201128 [details] patch GCC architectures don't have libc++. Add -stdlib=libstdc++ on them to CXXFLAGS and LDFLAGS to fix build. Tested on powerpc64 and amd64. Hardware sponsored by IntegriCloud.
Committed, thanks!
A commit references this bug: Author: yuri Date: Tue Jan 15 07:49:08 UTC 2019 New revision: 490351 URL: https://svnweb.freebsd.org/changeset/ports/490351 Log: audio/caps-lv2: fix build with GCC-based architectures GCC architectures don't have libc++. Add -stdlib=libstdc++ on them to CXXFLAGS and LDFLAGS to fix build. PR: 234943 Submitted by: Piotr Kubaj <pkubaj@anongoth.pl> Changes: head/audio/caps-lv2/Makefile