[SRC] Linking openttd
Undefined symbols for architecture x86_64:
  "_deflate", referenced from:
      ZlibSaveFilter::Write(unsigned char*, unsigned long) in saveload.o
      ZlibSaveFilter::Finish() in saveload.o
  "_deflateEnd", referenced from:
      ZlibSaveFilter::~ZlibSaveFilter() in saveload.o
      ZlibSaveFilter::~ZlibSaveFilter() in saveload.o
  "_deflateInit_", referenced from:
      SaveFilter* CreateSaveFilter<ZlibSaveFilter>(SaveFilter*, unsigned char) in saveload.o
  "_gzclose", referenced from:
      ClientNetworkContentSocketHandler::AfterDownload() in network_content.o
  "_gzdopen", referenced from:
      ClientNetworkContentSocketHandler::AfterDownload() in network_content.o
  "_gzerror", referenced from:
      ClientNetworkContentSocketHandler::AfterDownload() in network_content.o
  "_gzread", referenced from:
      ClientNetworkContentSocketHandler::AfterDownload() in network_content.o
  "_inflate", referenced from:
      ZlibLoadFilter::Read(unsigned char*, unsigned long) in saveload.o
      TextfileWindow::LoadTextfile(char const*, Subdirectory) in textfile_gui.o
  "_inflateEnd", referenced from:
      ZlibLoadFilter::~ZlibLoadFilter() in saveload.o
      ZlibLoadFilter::~ZlibLoadFilter() in saveload.o
      TextfileWindow::LoadTextfile(char const*, Subdirectory) in textfile_gui.o
  "_inflateInit2_", referenced from:
      TextfileWindow::LoadTextfile(char const*, Subdirectory) in textfile_gui.o
  "_inflateInit_", referenced from:
      LoadFilter* CreateLoadFilter<ZlibLoadFilter>(LoadFilter*) in saveload.o
  "_zlibVersion", referenced from:
      CrashLog::LogLibraries(char*, char const*) const in crashlog.o
      CrashLog::FillCrashLog(char*, char const*) const in crashlog.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [openttd] Error 1
make: *** [all] Error 1