# python/CUDA development
**URL:** https://discourse.nixos.org/t/python-cuda-development/59427
**Category:** Help
**Created:** [January 27, 2025, 8:12am UTC](https://discourse.nixos.org/t/python-cuda-development/59427 "2025-01-27T08:12:14Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@lucassong3000](https://discourse.nixos.org/u/lucassong3000)
#### Post date: [January 27, 2025, 8:12am UTC](https://discourse.nixos.org/t/python-cuda-development/59427/1 "2025-01-27T08:12:14Z")
Hello nix people,
i was having trouble installing a python library that requires CUDA, using pip within a conda-shell, that is globally installed.
then i came across this amazing piece of code shared by this amazing person:
`https://gist.github.com/ChadSki/926e5633961c9b48131eabd32e57adb2`
the problem, however, is that, though the `NIXPKGS_ALLOW_UNFREE=1 nix develop --impure` command run flawlessly, i wouldnt be able to use conda within that flake environment.
`exec: Failed to execute process '/home/alice7/.conda/bin/conda': The file specified the interpreter '/home/alice7/.conda/bin/python', which is not an executable command.`
The globally installed conda wont have such problems, but it will not help with CUDA development, besides, a local conda/CUDA environment with flake is just more elegant, any insights will be appreciated.
---
### Author:  [@lucassong3000](https://discourse.nixos.org/u/lucassong3000)
#### Post date: [January 27, 2025, 8:18am UTC](https://discourse.nixos.org/t/python-cuda-development/59427/2 "2025-01-27T08:18:38Z")
my silly attempt `chmod +x ~/.conda/bin/conda` did not help
---
### Author:  [@lucassong3000](https://discourse.nixos.org/u/lucassong3000)
#### Post date: [January 27, 2025, 8:21am UTC](https://discourse.nixos.org/t/python-cuda-development/59427/4 "2025-01-27T08:21:17Z")
````auto
description = "An FHS shell with conda and cuda.";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
};
outputs = { self, nixpkgs, home-manager }:
let
pkgs = nixpkgs.legacyPackages.x86_64-linux;
# Conda installs it's packages and environments under this directory
installationPath = "~/.conda";
# Downloaded Miniconda installer
minicondaScript = pkgs.stdenv.mkDerivation rec {
name = "miniconda-${version}";
version = "4.3.11";
src = pkgs.fetchurl {
url = "https://repo.continuum.io/miniconda/Miniconda3-${version}-Linux-x86_64.sh";
sha256 = "1f2g8x1nh8xwcdh09xcra8vd15xqb5crjmpvmc2xza3ggg771zmr";
};
# Nothing to unpack.
unpackPhase = "true";
# Rename the file so it's easier to use. The file needs to have .sh ending
# because the installation script does some checks based on that assumption.
# However, don't add it under $out/bin/ becase we don't really want to use
# it within our environment. It is called by "conda-install" defined below.
installPhase = ''
mkdir -p $out
cp $src $out/miniconda.sh
'';
# Add executable mode here after the fixup phase so that no patching will be
# done by nix because we want to use this miniconda installer in the FHS
# user env.
fixupPhase = ''
chmod +x $out/miniconda.sh
'';
};
# Wrap miniconda installer so that it is non-interactive and installs into the
# path specified by installationPath
conda = pkgs.runCommand "conda-install"
{ buildInputs = [pkgs.makeWrapper minicondaScript]; }
''
mkdir -p $out/bin
makeWrapper \
${minicondaScript}/miniconda.sh \
$out/bin/conda-install \
--add-flags "-p ${installationPath}" \
--add-flags "-b"
'';
in {
devShell.x86_64-linux = (pkgs.buildFHSUserEnv {
name = "conda";
targetPkgs = pkgs: (
with pkgs; [
autoconf
binutils
conda
cudatoolkit
curl
freeglut
gcc11
git
gitRepo
gnumake
gnupg
gperf
libGLU libGL
libselinux
linuxPackages.nvidia_x11
m4
ncurses5
procps
stdenv.cc
unzip
util-linux
wget
xorg.libICE
xorg.libSM
xorg.libX11
xorg.libXext
xorg.libXi
xorg.libXmu
xorg.libXrandr
xorg.libXrender
xorg.libXv
zlib
]
);
profile = ''
# cuda
export CUDA_PATH=${pkgs.cudatoolkit}
# export LD_LIBRARY_PATH=${pkgs.linuxPackages.nvidia_x11}/lib
export EXTRA_LDFLAGS="-L/lib -L${pkgs.linuxPackages.nvidia_x11}/lib"
export EXTRA_CCFLAGS="-I/usr/include"
# conda
export PATH=${installationPath}/bin:$PATH
# Paths for gcc if compiling some C sources with pip
export NIX_CFLAGS_COMPILE="-I${installationPath}/include"
export NIX_CFLAGS_LINK="-L${installationPath}lib"
# Some other required environment variables
export FONTCONFIG_FILE=/etc/fonts/fonts.conf
export QTCOMPOSE=${pkgs.xorg.libX11}/share/X11/locale
'';
}).env;
};
}```
````
---
### Author:  [@lucassong3000](https://discourse.nixos.org/u/lucassong3000)
#### Post date: [January 27, 2025, 8:22am UTC](https://discourse.nixos.org/t/python-cuda-development/59427/5 "2025-01-27T08:22:24Z")
`IXPKGS_ALLOW_UNFREE=1 nix develop --impure` ran through without any error