text: { stdenv, fetchgit, postgresql }:
  
  stdenv.mkDerivation rec {
    pname = "smlar-unstable";
    version = "2020-04-08";
  
    src = fetchgit {
      url = "git://sigaev.ru/smlar.git";
      rev = "0c345af71969d9863bb76efa833391d00705669e";
      sha256 = "1pr3pbnjc9n209l52sgsn4xqzp92qk6wci55hcqjjrwf2gdxy0yr";
    };
  
    buildInputs = [ postgresql ];
  
    makeFlags = [ "USE_PGXS=1" ];
  
    installPhase = ''
      install -D -t $out/lib *.so
      install -D -t $out/share/postgresql/extension *.sql
      install -D -t $out/share/postgresql/extension *.control
    '';
  
    meta = with stdenv.lib; {
      description = "Compute similary of any one-dimensional arrays";
      homepage = "http://sigaev.ru/git/gitweb.cgi?p=smlar.git";
      platforms = postgresql.meta.platforms;
      license = licenses.bsd2;
      maintainers = [ maintainers.marsam ];
    };
  }
  