$ poudriere jail -cj clang7 -a amd64 -v projects/clang700-import -m svn+https $ poudriere testport -j clang7 deskutils/kdepim-kde4 [...] korganizer/kodaymatrix.cpp:865:39: error: ordered comparison between pointer and zero ('const void *' and 'int') if ( mEvents.contains( mDays[i] ) > 0 ) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~ http://package18.nyi.freebsd.org/data/headamd64PR230355gnucxx98-default/2018-08-26_10h16m34s/logs/errors/kdepim-kde4-4.14.10_15.log
A commit references this bug: Author: adridg Date: Thu Aug 30 09:57:20 UTC 2018 New revision: 478439 URL: https://svnweb.freebsd.org/changeset/ports/478439 Log: Fix build with clang7. PR: 230941 Reported by: jbeich Changes: head/deskutils/kdepim-kde4/files/patch-korganizer_kodaymatrix.cpp
There is another commit for it: https://svnweb.freebsd.org/ports?view=revision&revision=478729
Built successfully on 12- with the clang7 branch after that second commit.