Dmitry Makovey

Support for variable expressions is mentioned in [Dockerfile reference](https://docs.docker.com/reference/dockerfile/#environment-replacement)

thanks for the fast response @arsv . This Perl build is atop of mostly static base toolchain, with only `glibc` being shared library. I'll take a closer look at Dynaloader...

``` $ grep dynamic_ext config.sh dynamic_ext='' fullpath_dynamic_ext='' disabled_dynamic_ext='ext/Amiga-ARexx ext/Amiga-Exec ext/GDBM_File ext/NDBM_File ext/ODBM_File ext/VMS-DCLsym ext/VMS-Stdio ext/Win32CORE cpan/DB_File cpan/Win32 cpan/Win32API-File' ``` but I see it under `static`: ``` $ grep static_ext config.sh...

removing `--all-static` brings `Fcntl.pm` back... Is `--all-static` not supposed to build shared library into `perl` binary yet still deploy `Fcntl.pm` ?