diff --git a/default.nix b/default.nix
index 4f2eadb..ec369a7 100644
--- a/default.nix
+++ b/default.nix
@@ -1,27 +1,30 @@
+{ mkDerivation, ad, aeson, base, bytestring, containers
+, deepseq, directory, filepath, lib, process, random
+, raw-strings-qq, split, tasty, tasty-expected-failure
+, tasty-golden, tasty-hunit, temporary, which, pkgs
+}:
 let
-  sources = import nix/sources.nix {};
-  haskell-nix = (import sources."haskell.nix" {});
-  nixpkgs = haskell-nix.pkgs;
-  gitignore = (import sources."gitignore.nix" {
-    inherit (nixpkgs) lib;
-  }).gitignoreSource;
-
-  src = nixpkgs.lib.cleanSourceWith {
-    name = "matplotlib";
-    src = gitignore ./.;
-  };
+  python = pkgs.python3.withPackages (p: with p; [
+    matplotlib
+    numpy
+    scipy
+  ]);
 in
-nixpkgs.haskell-nix.stackProject {
-  inherit src;
-  modules = [({pkgs, ...}: {
-    packages.matplotlib.components.library.build-tools =
-      [ pkgs.buildPackages.python39Packages.matplotlib
-        pkgs.buildPackages.python39Packages.scipy
-        pkgs.buildPackages.texlive.combined.scheme-small ];
-    packages.matplotlib.components.tests.matplotlib-test.build-tools =
-      [ pkgs.buildPackages.python39Packages.matplotlib
-        pkgs.buildPackages.python39Packages.scipy
-        pkgs.buildPackages.texlive.combined.scheme-small ];
-    doHaddock = false;
-  })];
+mkDerivation {
+  pname = "matplotlib";
+  version = "0.7.7";
+  src = ./.;
+  libraryHaskellDepends = [
+    aeson base bytestring containers deepseq filepath process split
+    temporary which
+  ];
+  testHaskellDepends = [
+    ad base bytestring directory process random raw-strings-qq split
+    tasty tasty-expected-failure tasty-golden tasty-hunit temporary
+  ];
+  librarySystemDepends = [ python which ];
+  testSystemDepends = [ python which ];
+  homepage = "https://github.com/abarbu/matplotlib-haskell";
+  description = "Bindings to Matplotlib; a Python plotting library";
+  license = lib.licenses.bsd3;
 }
diff --git a/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/Graphics/Matplotlib.dyn_hi b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/Graphics/Matplotlib.dyn_hi
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diff --git a/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/Graphics/Matplotlib/Internal.o b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/Graphics/Matplotlib/Internal.o
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diff --git a/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/Paths_matplotlib.hs b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/Paths_matplotlib.hs
new file mode 100644
index 0000000..29bc066
--- /dev/null
+++ b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/Paths_matplotlib.hs
@@ -0,0 +1,74 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE NoRebindableSyntax #-}
+{-# OPTIONS_GHC -fno-warn-missing-import-lists #-}
+{-# OPTIONS_GHC -w #-}
+module Paths_matplotlib (
+    version,
+    getBinDir, getLibDir, getDynLibDir, getDataDir, getLibexecDir,
+    getDataFileName, getSysconfDir
+  ) where
+
+
+import qualified Control.Exception as Exception
+import qualified Data.List as List
+import Data.Version (Version(..))
+import System.Environment (getEnv)
+import Prelude
+
+
+#if defined(VERSION_base)
+
+#if MIN_VERSION_base(4,0,0)
+catchIO :: IO a -> (Exception.IOException -> IO a) -> IO a
+#else
+catchIO :: IO a -> (Exception.Exception -> IO a) -> IO a
+#endif
+
+#else
+catchIO :: IO a -> (Exception.IOException -> IO a) -> IO a
+#endif
+catchIO = Exception.catch
+
+version :: Version
+version = Version [0,7,7] []
+
+getDataFileName :: FilePath -> IO FilePath
+getDataFileName name = do
+  dir <- getDataDir
+  return (dir `joinFileName` name)
+
+getBinDir, getLibDir, getDynLibDir, getDataDir, getLibexecDir, getSysconfDir :: IO FilePath
+
+
+
+bindir, libdir, dynlibdir, datadir, libexecdir, sysconfdir :: FilePath
+bindir     = "/home/lazylambda/.cabal/bin"
+libdir     = "/home/lazylambda/.cabal/lib/x86_64-linux-ghc-8.10.7/matplotlib-0.7.7-inplace"
+dynlibdir  = "/home/lazylambda/.cabal/lib/x86_64-linux-ghc-8.10.7"
+datadir    = "/home/lazylambda/.cabal/share/x86_64-linux-ghc-8.10.7/matplotlib-0.7.7"
+libexecdir = "/home/lazylambda/.cabal/libexec/x86_64-linux-ghc-8.10.7/matplotlib-0.7.7"
+sysconfdir = "/home/lazylambda/.cabal/etc"
+
+getBinDir     = catchIO (getEnv "matplotlib_bindir")     (\_ -> return bindir)
+getLibDir     = catchIO (getEnv "matplotlib_libdir")     (\_ -> return libdir)
+getDynLibDir  = catchIO (getEnv "matplotlib_dynlibdir")  (\_ -> return dynlibdir)
+getDataDir    = catchIO (getEnv "matplotlib_datadir")    (\_ -> return datadir)
+getLibexecDir = catchIO (getEnv "matplotlib_libexecdir") (\_ -> return libexecdir)
+getSysconfDir = catchIO (getEnv "matplotlib_sysconfdir") (\_ -> return sysconfdir)
+
+
+
+
+joinFileName :: String -> String -> FilePath
+joinFileName ""  fname = fname
+joinFileName "." fname = fname
+joinFileName dir ""    = dir
+joinFileName dir fname
+  | isPathSeparator (List.last dir) = dir ++ fname
+  | otherwise                       = dir ++ pathSeparator : fname
+
+pathSeparator :: Char
+pathSeparator = '/'
+
+isPathSeparator :: Char -> Bool
+isPathSeparator c = c == '/'
diff --git a/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/cabal_macros.h b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/cabal_macros.h
new file mode 100644
index 0000000..be30ad4
--- /dev/null
+++ b/dist-newstyle/build/x86_64-linux/ghc-8.10.7/matplotlib-0.7.7/build/autogen/cabal_macros.h
@@ -0,0 +1,203 @@
+/* DO NOT EDIT: This file is automatically generated by Cabal */
+
+/* package matplotlib-0.7.7 */
+#ifndef VERSION_matplotlib
+#define VERSION_matplotlib "0.7.7"
+#endif /* VERSION_matplotlib */
+#ifndef MIN_VERSION_matplotlib
+#define MIN_VERSION_matplotlib(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  7 || \
+  (major1) == 0 && (major2) == 7 && (minor) <= 7)
+#endif /* MIN_VERSION_matplotlib */
+/* package aeson-1.5.6.0 */
+#ifndef VERSION_aeson
+#define VERSION_aeson "1.5.6.0"
+#endif /* VERSION_aeson */
+#ifndef MIN_VERSION_aeson
+#define MIN_VERSION_aeson(major1,major2,minor) (\
+  (major1) <  1 || \
+  (major1) == 1 && (major2) <  5 || \
+  (major1) == 1 && (major2) == 5 && (minor) <= 6)
+#endif /* MIN_VERSION_aeson */
+/* package base-4.14.3.0 */
+#ifndef VERSION_base
+#define VERSION_base "4.14.3.0"
+#endif /* VERSION_base */
+#ifndef MIN_VERSION_base
+#define MIN_VERSION_base(major1,major2,minor) (\
+  (major1) <  4 || \
+  (major1) == 4 && (major2) <  14 || \
+  (major1) == 4 && (major2) == 14 && (minor) <= 3)
+#endif /* MIN_VERSION_base */
+/* package bytestring-0.10.12.0 */
+#ifndef VERSION_bytestring
+#define VERSION_bytestring "0.10.12.0"
+#endif /* VERSION_bytestring */
+#ifndef MIN_VERSION_bytestring
+#define MIN_VERSION_bytestring(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  10 || \
+  (major1) == 0 && (major2) == 10 && (minor) <= 12)
+#endif /* MIN_VERSION_bytestring */
+/* package containers-0.6.5.1 */
+#ifndef VERSION_containers
+#define VERSION_containers "0.6.5.1"
+#endif /* VERSION_containers */
+#ifndef MIN_VERSION_containers
+#define MIN_VERSION_containers(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  6 || \
+  (major1) == 0 && (major2) == 6 && (minor) <= 5)
+#endif /* MIN_VERSION_containers */
+/* package deepseq-1.4.4.0 */
+#ifndef VERSION_deepseq
+#define VERSION_deepseq "1.4.4.0"
+#endif /* VERSION_deepseq */
+#ifndef MIN_VERSION_deepseq
+#define MIN_VERSION_deepseq(major1,major2,minor) (\
+  (major1) <  1 || \
+  (major1) == 1 && (major2) <  4 || \
+  (major1) == 1 && (major2) == 4 && (minor) <= 4)
+#endif /* MIN_VERSION_deepseq */
+/* package filepath-1.4.2.1 */
+#ifndef VERSION_filepath
+#define VERSION_filepath "1.4.2.1"
+#endif /* VERSION_filepath */
+#ifndef MIN_VERSION_filepath
+#define MIN_VERSION_filepath(major1,major2,minor) (\
+  (major1) <  1 || \
+  (major1) == 1 && (major2) <  4 || \
+  (major1) == 1 && (major2) == 4 && (minor) <= 2)
+#endif /* MIN_VERSION_filepath */
+/* package process-1.6.13.2 */
+#ifndef VERSION_process
+#define VERSION_process "1.6.13.2"
+#endif /* VERSION_process */
+#ifndef MIN_VERSION_process
+#define MIN_VERSION_process(major1,major2,minor) (\
+  (major1) <  1 || \
+  (major1) == 1 && (major2) <  6 || \
+  (major1) == 1 && (major2) == 6 && (minor) <= 13)
+#endif /* MIN_VERSION_process */
+/* package split-0.2.3.4 */
+#ifndef VERSION_split
+#define VERSION_split "0.2.3.4"
+#endif /* VERSION_split */
+#ifndef MIN_VERSION_split
+#define MIN_VERSION_split(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  2 || \
+  (major1) == 0 && (major2) == 2 && (minor) <= 3)
+#endif /* MIN_VERSION_split */
+/* package temporary-1.3 */
+#ifndef VERSION_temporary
+#define VERSION_temporary "1.3"
+#endif /* VERSION_temporary */
+#ifndef MIN_VERSION_temporary
+#define MIN_VERSION_temporary(major1,major2,minor) (\
+  (major1) <  1 || \
+  (major1) == 1 && (major2) <  3 || \
+  (major1) == 1 && (major2) == 3 && (minor) <= 0)
+#endif /* MIN_VERSION_temporary */
+/* package which-0.2.0.1 */
+#ifndef VERSION_which
+#define VERSION_which "0.2.0.1"
+#endif /* VERSION_which */
+#ifndef MIN_VERSION_which
+#define MIN_VERSION_which(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  2 || \
+  (major1) == 0 && (major2) == 2 && (minor) <= 0)
+#endif /* MIN_VERSION_which */
+
+/* tool gcc-10.3.0 */
+#ifndef TOOL_VERSION_gcc
+#define TOOL_VERSION_gcc "10.3.0"
+#endif /* TOOL_VERSION_gcc */
+#ifndef MIN_TOOL_VERSION_gcc
+#define MIN_TOOL_VERSION_gcc(major1,major2,minor) (\
+  (major1) <  10 || \
+  (major1) == 10 && (major2) <  3 || \
+  (major1) == 10 && (major2) == 3 && (minor) <= 0)
+#endif /* MIN_TOOL_VERSION_gcc */
+/* tool ghc-8.10.7 */
+#ifndef TOOL_VERSION_ghc
+#define TOOL_VERSION_ghc "8.10.7"
+#endif /* TOOL_VERSION_ghc */
+#ifndef MIN_TOOL_VERSION_ghc
+#define MIN_TOOL_VERSION_ghc(major1,major2,minor) (\
+  (major1) <  8 || \
+  (major1) == 8 && (major2) <  10 || \
+  (major1) == 8 && (major2) == 10 && (minor) <= 7)
+#endif /* MIN_TOOL_VERSION_ghc */
+/* tool ghc-pkg-8.10.7 */
+#ifndef TOOL_VERSION_ghc_pkg
+#define TOOL_VERSION_ghc_pkg "8.10.7"
+#endif /* TOOL_VERSION_ghc_pkg */
+#ifndef MIN_TOOL_VERSION_ghc_pkg
+#define MIN_TOOL_VERSION_ghc_pkg(major1,major2,minor) (\
+  (major1) <  8 || \
+  (major1) == 8 && (major2) <  10 || \
+  (major1) == 8 && (major2) == 10 && (minor) <= 7)
+#endif /* MIN_TOOL_VERSION_ghc_pkg */
+/* tool haddock-2.24.2 */
+#ifndef TOOL_VERSION_haddock
+#define TOOL_VERSION_haddock "2.24.2"
+#endif /* TOOL_VERSION_haddock */
+#ifndef MIN_TOOL_VERSION_haddock
+#define MIN_TOOL_VERSION_haddock(major1,major2,minor) (\
+  (major1) <  2 || \
+  (major1) == 2 && (major2) <  24 || \
+  (major1) == 2 && (major2) == 24 && (minor) <= 2)
+#endif /* MIN_TOOL_VERSION_haddock */
+/* tool hpc-0.68 */
+#ifndef TOOL_VERSION_hpc
+#define TOOL_VERSION_hpc "0.68"
+#endif /* TOOL_VERSION_hpc */
+#ifndef MIN_TOOL_VERSION_hpc
+#define MIN_TOOL_VERSION_hpc(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  68 || \
+  (major1) == 0 && (major2) == 68 && (minor) <= 0)
+#endif /* MIN_TOOL_VERSION_hpc */
+/* tool hsc2hs-0.68.7 */
+#ifndef TOOL_VERSION_hsc2hs
+#define TOOL_VERSION_hsc2hs "0.68.7"
+#endif /* TOOL_VERSION_hsc2hs */
+#ifndef MIN_TOOL_VERSION_hsc2hs
+#define MIN_TOOL_VERSION_hsc2hs(major1,major2,minor) (\
+  (major1) <  0 || \
+  (major1) == 0 && (major2) <  68 || \
+  (major1) == 0 && (major2) == 68 && (minor) <= 7)
+#endif /* MIN_TOOL_VERSION_hsc2hs */
+/* tool runghc-8.10.7 */
+#ifndef TOOL_VERSION_runghc
+#define TOOL_VERSION_runghc "8.10.7"
+#endif /* TOOL_VERSION_runghc */
+#ifndef MIN_TOOL_VERSION_runghc
+#define MIN_TOOL_VERSION_runghc(major1,major2,minor) (\
+  (major1) <  8 || \
+  (major1) == 8 && (major2) <  10 || \
+  (major1) == 8 && (major2) == 10 && (minor) <= 7)
+#endif /* MIN_TOOL_VERSION_runghc */
+/* tool strip-2.35 */
+#ifndef TOOL_VERSION_strip
+#define TOOL_VERSION_strip "2.35"
+#endif /* TOOL_VERSION_strip */
+#ifndef MIN_TOOL_VERSION_strip
+#define MIN_TOOL_VERSION_strip(major1,major2,minor) (\
+  (major1) <  2 || \
+  (major1) == 2 && (major2) <  35 || \
+  (major1) == 2 && (major2) == 35 && (minor) <= 0)
+#endif /* MIN_TOOL_VERSION_strip */
+
+#ifndef CURRENT_PACKAGE_KEY
+#define CURRENT_PACKAGE_KEY "matplotlib-0.7.7-inplace"
+#endif /* CURRENT_packageKey */
+#ifndef CURRENT_COMPONENT_ID
+#define CURRENT_COMPONENT_ID "matplotlib-0.7.7-inplace"
+#endif /* CURRENT_COMPONENT_ID */
+#ifndef CURRENT_PACKAGE_VERSION
+#define CURRENT_PACKAGE_VERSION "0.7.7"
+#endif /* CURRENT_PACKAGE_VERSION */
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+++ b/dist-newstyle/cache/plan.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/dist-newstyle/cache/solver-plan b/dist-newstyle/cache/solver-plan
new file mode 100644
index 0000000..9672a10
Binary files /dev/null and b/dist-newstyle/cache/solver-plan differ
diff --git a/dist-newstyle/cache/source-hashes b/dist-newstyle/cache/source-hashes
new file mode 100644
index 0000000..af8a6fd
Binary files /dev/null and b/dist-newstyle/cache/source-hashes differ
diff --git a/dist-newstyle/cache/up-to-date b/dist-newstyle/cache/up-to-date
new file mode 100644
index 0000000..68c220d
Binary files /dev/null and b/dist-newstyle/cache/up-to-date differ
diff --git a/dist-newstyle/packagedb/ghc-8.10.7/package.cache b/dist-newstyle/packagedb/ghc-8.10.7/package.cache
new file mode 100644
index 0000000..b3cae5c
Binary files /dev/null and b/dist-newstyle/packagedb/ghc-8.10.7/package.cache differ
diff --git a/dist-newstyle/packagedb/ghc-8.10.7/package.cache.lock b/dist-newstyle/packagedb/ghc-8.10.7/package.cache.lock
new file mode 100644
index 0000000..e69de29
diff --git a/matplotlib.cabal b/matplotlib.cabal
index 2e9670e..5ab6c5b 100644
--- a/matplotlib.cabal
+++ b/matplotlib.cabal
@@ -32,6 +32,7 @@ library
                      , temporary
                      , containers
                      , split
+                     , which 
                      , filepath
   default-language:    Haskell2010
 
@@ -53,6 +54,7 @@ test-suite matplotlib-test
                      , raw-strings-qq
                      , split
                      , ad
+                     , which
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
   default-language:    Haskell2010
 
diff --git a/shell.nix b/shell.nix
index 43b0f36..43214c9 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,13 +1,16 @@
-(import ./default.nix).shellFor {
-  tools = {
-    cabal = "latest";
-    hpack = "latest";
-    hlint = "latest";
-    ormolu = "latest";
-    haskell-language-server = "latest";
-  };
+{ nixpkgs ? import <nixpkgs> {}
+, compiler ? "default"
+, doBenchmark ? false }:
 
-  # Prevents cabal from choosing alternate plans, so that
-  # *all* dependencies are provided by Nix.
-  exactDeps = true;
-}
+let
+  inherit (nixpkgs) pkgs;
+  haskellPackages = if compiler == "default"
+                       then pkgs.haskellPackages
+                       else pkgs.haskell.packages.${compiler};
+
+  variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;
+  matplotlib = import ./default.nix;
+  drv = variant (haskellPackages.callPackage matplotlib {});
+
+in
+  if pkgs.lib.inNixShell then drv.env else drv
diff --git a/src/Graphics/Matplotlib/Internal.hs b/src/Graphics/Matplotlib/Internal.hs
index 83ebf06..8278a44 100644
--- a/src/Graphics/Matplotlib/Internal.hs
+++ b/src/Graphics/Matplotlib/Internal.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE FlexibleInstances, ScopedTypeVariables, FlexibleContexts, ExtendedDefaultRules, ExistentialQuantification, CPP #-}
+{-# LANGUAGE FlexibleInstances, ScopedTypeVariables, FlexibleContexts, ExtendedDefaultRules, ExistentialQuantification, CPP, TemplateHaskell #-}
 -- |
 -- Internal representations of the Matplotlib data. These are not API-stable
 -- and may change. You can easily extend the provided bindings without relying
@@ -10,6 +10,7 @@ import Data.Aeson
 import Control.Monad
 import Control.DeepSeq
 import System.IO
+import System.Which
 import qualified Data.ByteString.Lazy as B
 import Data.List
 import Control.Exception
@@ -139,7 +140,7 @@ m # v | S.null $ mpRest m =
 -- rendered as 'str'.
 data S = S String
   deriving (Show, Eq, Ord)
-
+ 
 -- | A string to be rendered in python as a raw string. In other words it is
 -- rendered as r'str'.
 data R = R String
@@ -316,6 +317,9 @@ bindDefaultFn os os' = merge ps' ps ++ (nub $ ks' ++ ks)
 
 -- $ Python operations
 
+python' :: String
+python' = $(staticWhich "python3") 
+
 -- | Run python given a code string.
 python :: Foldable t => t String -> IO (Either String String)
 python codeStr =
@@ -323,7 +327,7 @@ python codeStr =
          (\codeFile codeHandle -> do
              forM_ codeStr (hPutStrLn codeHandle)
              hClose codeHandle
-             Right <$> readProcess "env" ["python3", codeFile] ""))
+             Right <$> readProcess python' [codeFile] ""))
          (\e -> return $ Left $ show (e :: IOException))
 
 pyBackend backend = "matplotlib.use('" ++ backend ++ "')"