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Crypt::OpenSSL::Guess - Guess OpenSSL include path


use ExtUtils::MakerMaker;
use Crypt::OpenSSL::Guess;

    # ...
    LIBS => ['-lssl -lcrypto ' . openssl_lib_paths()],
    INC  => openssl_inc_paths(), # guess include path or get from $ENV{OPENSSL_PREFIX}


Crypt::OpenSSL::Guess provides helpers to guess OpenSSL include path on any platforms.

Often MacOS's homebrew OpenSSL cause a problem on installation due to include path is not added. Some CPAN module provides to modify include path with configure-args, but Carton or Module::CPANfile is not supported to pass configure-args to each modules. Crypt::OpenSSL::* modules should use it on your Makefile.PL.

This module resolves the include path by Net::SSLeay's workaround. Original code is taken from inc/Module/Install/PRIVATE/Net/ by Net::SSLeay.


  • openssl_inc_paths()

    This functions returns include paths in the format passed to CC. If OpenSSL could not find, then empty string is returned.

    openssl_inc_paths(); # on MacOS: "-I/usr/local/opt/openssl/include"
  • openssl_lib_paths()

    This functions returns library paths in the format passed to CC. If OpenSSL could not find, then empty string is returned.

    openssl_lib_paths(); # on MacOS: "-L/usr/local/opt/openssl -L/usr/local/opt/openssl/lib"
  • find_openssl_prefix([$dir])

    This function returns OpenSSL's prefix. If set OPENSSL_PREFIX environment variable, you can overwrite the return value.

    find_openssl_prefix(); # on MacOS: "/usr/local/opt/openssl"
  • find_openssl_exec($prefix)

    This functions returns OpenSSL's executable path.

    find_openssl_exec(); # on MacOS: "/usr/local/opt/openssl/bin/openssl"
  • ($major, $minor, $letter) = openssl_version()

    This functions returns OpenSSL's version as major, minor, letter.

    openssl_version(); # ("1.0", "2", "n")




Copyright (C) Takumi Akiyama.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


Takumi Akiyama