ports r471763 updated devel/libgit2 to 0.27.0 which broke devel/grv build on 2018Q2 (e.g. [1]) [1] http://beefy3.nyi.freebsd.org/data/111amd64-quarterly/471890/logs/grv-0.1.3.log
ports r470048 fixed the build (with libgit 0.27) in HEAD (latest) in bug 228273. Re-opening that issue there to get the MFH.
You should MFH that as libgit2 update 0.27.0 is preparation for libgit2 0.27.1 which fixes critical security vulnerability.
Please see also here for the vulnerability documentation for libgit2: https://reviews.freebsd.org/D15668
(In reply to Matthias Fechner from comment #2) The MFH has been requested in the original bug 228273, and this bug set to depend on it.
Ping koobs@. Is MFH still relevant?
Overcome by the creation of Q3 quarterlies.