building shlr/crc32

gistfile1.txt

Undefined symbols for architecture x86_64:
  "_crc32", referenced from:
      __zip_filerange_crc in zip_filerange_crc.o
      _crc_read in zip_source_crc.o
      _decrypt in zip_source_pkware.o
      __zip_string_crc32 in zip_string.o
     (maybe you meant: __zip_string_crc32)
  "_deflate", referenced from:
      _compress_read in zip_source_deflate.o
     (maybe you meant: _zip_source_deflate)
  "_deflateEnd", referenced from:
      _deflate_compress in zip_source_deflate.o
  "_deflateInit2_", referenced from:
      _deflate_compress in zip_source_deflate.o
  "_inflate", referenced from:
      _decompress_read in zip_source_deflate.o
  "_inflateEnd", referenced from:
      _deflate_decompress in zip_source_deflate.o
  "_inflateInit2_", referenced from:
      _deflate_decompress in zip_source_deflate.o
  "_zError", referenced from:
      __zip_error_strerror in zip_error_strerror.o
      _zip_error_to_str in zip_error_to_str.o