Hi, I have a set up which might be not so standard but on the other hand I think it will become more common: I run Ubuntu on Windows, not via virtualization but using the Linux subsystem for windows, as described here: https://msdn.microsoft.com/en-us/commandline/wsl/about This comes with Ubuntu 14.04 and you can simply apt-get packages from the same repos as the 'real' ubuntu. However I can't seem to install a new perl using either plenv or perlbrew, and I can also not install modules using system CPAN, and the issues seem to have to do with the current directory not being in @INC. Below is output of the build log from perlbrew: Writing Makefile for Pod::Functions make[1]: Entering directory `/home/michiel/perl5/perlbrew/build/perl-5.24.0/ext/Pod-Functions' "../../miniperl" "-I../../lib" "-I../../lib" Functions_pm.PL ../../pod/perlfunc.pod Can't locate Pod/Simple/SimpleTree.pm in @INC (you may need to install the Pod::Simple::SimpleTree module) (@INC contains: /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/AutoLoader/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/Carp/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/PathTools /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/PathTools/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/ExtUtils-Install/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/ExtUtils-MakeMaker/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/ExtUtils-Manifest/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/File-Path/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/ext/re /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/Term-ReadLine/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/Exporter/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/ext/File-Find/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/Text-Tabs/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/dist/constant/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/cpan/version/lib /home/michiel/perl5/perlbrew/build/perl-5.24.0/lib ../../lib .) at Functions_pm.PL line 3. And this is manually installing a trivial CPAN module on the system perl (ofc using cpan or cpanm gives similar results): michiel@DESKTOP-SNC7OPQ:~$ wget https://cpan.metacpan.org/authors/id/G/GA/GAAS/HTTP-Date-6.02.tar.gz --2016-09-23 10:12:59-- https://cpan.metacpan.org/authors/id/G/GA/GAAS/HTTP-Date-6.02.tar.gz Resolving cpan.metacpan.org (cpan.metacpan.org)... 151.101.36.129 Connecting to cpan.metacpan.org (cpan.metacpan.org)|151.101.36.129|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 7319 (7.1K) [application/x-gzip] Saving to: ‘HTTP-Date-6.02.tar.gz’ 100%[==============================================================================>] 7,319 --.-K/s in 0.001s 2016-09-23 10:12:59 (12.7 MB/s) - ‘HTTP-Date-6.02.tar.gz’ saved [7319/7319] michiel@DESKTOP-SNC7OPQ:~$ tar xf HTTP-Date-6.02.tar.gz michiel@DESKTOP-SNC7OPQ:~$ cd HTTP-Date-6.02/ michiel@DESKTOP-SNC7OPQ:~/HTTP-Date-6.02$ perl Makefile.PL Checking if your kit is complete... Warning: the following files are missing in your kit: lib/HTTP/Date.pm t/date.t Please inform the author. Writing Makefile for HTTP::Date Writing MYMETA.yml and MYMETA.json michiel@DESKTOP-SNC7OPQ:~/HTTP-Date-6.02$ make && make test PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t t/date.t .. Can't locate HTTP/Date.pm in @INC (you may need to install the HTTP::Date module) (@INC contains: /home/michiel/HTTP-Date-6.02/blib/lib /home/michiel/HTTP-Date-6.02/blib/arch /etc/perl /usr/local/lib/perl/5.18.2 /usr/local/share/perl/5.18.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.18 /usr/share/perl/5.18 /usr/local/lib/site_perl .) at t/date.t line 8. BEGIN failed--compilation aborted at t/date.t line 8. t/date.t .. Dubious, test returned 2 (wstat 512, 0x200) No subtests run Test Summary Report ------------------- t/date.t (Wstat: 512 Tests: 0 Failed: 0) Non-zero exit status: 2 Parse errors: No plan found in TAP output Files=1, Tests=0, 0 wallclock secs ( 0.00 usr 0.07 sys + 0.04 cusr 0.03 csys = 0.14 CPU) Result: FAIL Failed 1/1 test programs. 0/0 subtests failed. make: *** [test_dynamic] Error 2 michiel@DESKTOP-SNC7OPQ:~/HTTP-Date-6.02$ Does anybody have advice? -- MichielThread Next