Hi, I found this today by accident - it seems that grep's ./configure doesn't work with the minimal bash (enabled in bash's configure via --enable-minimal-config).
One can verify that not only by the failed ./configure process but also by content of config.log - there are several messages like: configure:3536: error: fn_grep: expected pattern Tested with bash 4.4.23 and grep 3.3. First I thought it is a grep bug (i.e. using some bashism) but accidentally I had an ancient bash-2.05 lying around and could try its minimal configuration setup -- and indeed it works. So it would seem it is something which broke between 2.05 and 4.4.23. Cheers, Miro
