`bootstrap' fails with local gnulib dir

[git commit d69fa5284851b2b7aac25ffac638b6b379994db5] Calling ./bootstrap --skip-git --gnulib-srcdir=/home/wl/git/gnulib fails with bootstrap: error: Can't find, copy or download 'build-aux/git-version-gen', a required bootstrap: gnulib supplied file, please provide the locat

bootstrap: `m4/gnu/alloca.c' not found

[git d69fa5284851b2b7aac25ffac638b6b379994db5] After bypassing an issue with `--skip-git' (cf. http://lists.gnu.org/archive/html/bug-m4/2018-04/msg0.html), executing ./bootstrap --skip-git --gnulib-srcdir=/home/wl/git/gnulib/ fails with tests/gnu/Makefile.am:55: error: required file 'm