{ buildPythonPackage
, python
, dlib
, fetchFromGitHub
, cmake
}:

buildPythonPackage rec {
  pname = "dlib";
  version = "19.4";
  name = "${pname}-${version}";

  format = "setuptools";

  src = fetchFromGitHub {
    owner = "davisking";
    repo = "dlib";
    rev ="v${version}";
    sha256 = "0zqa36i4s5i7n6284sp22qrhm3k37n9vqmpz068nm02vj9h0a2j4";
  };

  LC_ALL = "en_US.UTF-8";
}

$ nix-shell -I nixpkgs=$HOME/nixpkgs -p pythonPackages.dlib
these derivations will be built:
  /nix/store/vgb5fh21jy51xs4vlcvx9wjszxxywwd5-python2.7-dlib-19.4.drv
building path(s) ‘/nix/store/x2wb2ilvl24f4zqndkhkmk0a0m3iwrhh-python2.7-dlib-19.4’
unpacking sources
unpacking source archive /nix/store/p3p5d3jgmm99pigq64amv1dgahvi1br8-dlib-v19.4-src
source root is dlib-v19.4-src
setting SOURCE_DATE_EPOCH to timestamp 315619200 of file dlib-v19.4-src/.travis.yml
patching sources
configuring
building
running bdist_wheel
running build
Exception:
Traceback (most recent call last):
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/req/req_set.py", line 784, in install
    **kwargs
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/req/req_install.py", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/req/req_install.py", line 1064, in move_wheel_files
    isolated=self.isolated,
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/wheel.py", line 345, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/nix/store/bk8wk20853xwyx41is4jl2q6db17apfb-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pip/wheel.py", line 323, in clobber
    shutil.copyfile(srcfile, destfile)
  File "/nix/store/3n3r10921c0mzfrq64hc4m2jzjk13qpr-python-2.7.13/lib/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: '/nix/store/3n3r10921c0mzfrq64hc4m2jzjk13qpr-python-2.7.13/lib/python2.7/site-packages/distro.py'
error: Cannot find cmake, ensure it is installed and in the path.
You can install cmake using the instructions at https://cmake.org/install/
You can also specify its path with --cmake parameter.
builder for ‘/nix/store/vgb5fh21jy51xs4vlcvx9wjszxxywwd5-python2.7-dlib-19.4.drv’ failed with exit code 1
error: build of ‘/nix/store/vgb5fh21jy51xs4vlcvx9wjszxxywwd5-python2.7-dlib-19.4.drv’ failed
/home/toelli/.nix-profile/bin/nix-shell: failed to build all dependencies