message: curl: Fix PKG_CONFIG_PATH.
diff: @@ -596,7 +596,7 @@ def configure(cxx_toolkit = None,
  # Be sure to control pkg-config, otherwise, because curl's
  # configure.ac checks pkg-config *before* --with-zlib, we might
  # end up using the system's copy instead ours.
  - 'PKG_CONFIG_PATH': drake.path_build(zlib_prefix, absolute = True) / 'lib' / 'pkgconfig',
  + 'PKG_CONFIG_PATH': str(drake.path_build(zlib_prefix, absolute = True) / 'lib' / 'pkgconfig'),
  }
  if cxx_toolkit.architecture is drake.architecture.arm:
  curl_configure_args.append('--host=%s' % cxx_toolkit.cxx[:-4])
  