As <<syphilis>> said:

I notice that XS_VERSION_BOOTCHECK has changed since perl-5.18 and no longer directly calls STR_WITH_LEN.

If I were you I would upgrade my perl and never think about it again.

In OSX something that really works for me well is:

  1. perlbrew (note Homebrew and perlbrew are not the same thing, perlbrew allows you to select which version of perl to use and also downloads, installs and uses any version of perl you instruct it to),
  2. cpanm for installing perl modules,
  3. important: if using perlbrew, shebang should now be: #!/usr/bin/env perl

#1 makes a lot of difference and definetely pokes a wooden pole in the chest of apple's perl.

glad you found a solution.

In reply to Re^3: PerlIO::Layers 0.011 fails to build in macOS 10.13.3 by bliako
in thread PerlIO::Layers 0.011 fails to build in macOS 10.13.3 by perlboy_emeritus

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