The port sets CONFIGURE_ARGS= --enable-exampledir=${PREFIX}/share/examples/quagga [...] CONFIGURE_ARGS= --enable-user=${ENABLE_USER} \ [...] so --enable-exampledir is never passed to the build. Is this a problem or can the first CONFIGURE_ARGS be removed?
Thanks for the pointer, this was really messed up, I hope the next change fixes it.
A commit references this bug: Author: pi Date: Tue Jan 8 12:47:05 UTC 2019 New revision: 489676 URL: https://svnweb.freebsd.org/changeset/ports/489676 Log: net/quagga: fix EXAMPLES option PR: 234738 Submitted by: tobik Changes: head/net/quagga/Makefile head/net/quagga/pkg-plist