A surprise awaits if you do the following:

$ git checkout mybranch
$ git tag -m “Working custom image” WORKS_06_21_2018
$ cd build-root
$ make PLATFORM=vpp TAG=vpp install-deb

.../build-root/scripts/version screws up, leading to a broken version.c which won’t compile.

Workaround: lay down another tag, in the expected format which will not cause drama later. For example:

$ git tag -m “D’oh, hate it when that happens” v18.07-rcX