binding.gyp

{
  'targets': [
    {
      'target_name': 'bignum',
      'sources': [ 'bignum.cc' ],
      'include_dirs': [
        "<!(node -e \"require('nan')\")"
      ],
      'conditions': [
        # For Windows, require either a 32-bit or 64-bit
        # separately-compiled OpenSSL library.
        # Currently set up to use with the following OpenSSL distro:
        #
        # http://slproweb.com/products/Win32OpenSSL.html
        [
          'OS=="win"', {
            'conditions': [
              [
                'target_arch=="x64"', {
                  'variables': {
                    'openssl_root%': 'C:/OpenSSL-Win64'
                  },
                }, {
                   'variables': {
                     'openssl_root%': 'C:/OpenSSL-Win32'
                    }
                }
              ]
            ],
            'libraries': [ 
              '-l<(openssl_root)/lib/libeay32.lib',
            ],
            'include_dirs': [
              '<(openssl_root)/include',
            ],
          },

          # Otherwise, if not Windows, link against the exposed OpenSSL
          # in Node.
          {
            'conditions': [
              [
                'target_arch=="ia32"', {
                  'variables': {
                    'openssl_config_path': '<(nodedir)/deps/openssl/config/piii'
                  }
                }
              ],
              [
                'target_arch=="x64"', {
                  'variables': {
                    'openssl_config_path': '<(nodedir)/deps/openssl/config/k8'
                  },
                }
              ],
              [
                'target_arch=="arm"', {
                  'variables': {
                    'openssl_config_path': '<(nodedir)/deps/openssl/config/arm'
                  }
                }
              ],
              [
                'target_arch=="arm64"', {
                  'variables': {
                    'openssl_config_path': '<(nodedir)/deps/openssl/config/aarch64'
                  }
                },
              ],
              [
                'target_arch=="ppc64"', {
                  'variables': {
                    'openssl_config_path': '<(nodedir)/deps/openssl/config/powerpc64'
                  }
                },
              ]
            ],
            'include_dirs': [
              "<(nodedir)/deps/openssl/openssl/include",
              "<(openssl_config_path)"
            ]
          }
        ]
      ]
    }
  ]
}