$> nix build -f . pythonPackages.mysqlclient
builder for '/nix/store/1wcp8ym36476w0h89ayqxcm936fm4xrq-python2.7-mysqlclient-1.4.2.post1.drv' failed with exit code 1; last 10 log lines:
  Traceback (most recent call last):
    File "nix_run_setup", line 8, in <module>
      exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
    File "setup.py", line 16, in <module>
      metadata, options = get_config()
    File "/build/mysqlclient-1.4.2.post1/setup_posix.py", line 51, in get_config
      libs = mysql_config("libs")
    File "/build/mysqlclient-1.4.2.post1/setup_posix.py", line 29, in mysql_config
      raise EnvironmentError("%s not found" % (_mysql_config_path,))
  EnvironmentError: mysql_config not found
[0 built (1 failed), 5 copied (55.7 MiB), 10.4 MiB DL]
error: build of '/nix/store/1wcp8ym36476w0h89ayqxcm936fm4xrq-python2.7-mysqlclient-1.4.2.post1.drv' failed