[Nix-dev] Xlib.h not found on go get -v github.com/veandco/go-sdl2/sdl

[Paul Dufresne]

Well, I am mostly user-level in NixOS.
I modify my /etc/nixos/configuration.nix then #nixos-rebuild -switch

I am learning GO.
I have been able to get ncurses to work in go.

I was now trying with SDL:
[guest at nixos:~]$ go get -v github.com/veandco/go-sdl2/sdl{,_mixer,_image,_ttf}
github.com/veandco/go-sdl2/sdl
# github.com/veandco/go-sdl2/sdl
In file included from go/src/github.com/veandco/go-sdl2/sdl/syswm.go:9:0:
/nix/store/0lryp5ww28x21l74mmh42gnv6xdp45bw-SDL2-2.0.3/include/SDL2/SDL_syswm.h:70:22:
fatal error: X11/Xlib.h: No such file or directory
 #include <X11/Xlib.h>
                      ^
compilation terminated.

[guest at nixos:~]$

Well, I can vaguely understand I should build this, with a nix
expression giving me go and Xlib as a "dependency".
But, although I did read about nix expressions, I never really wrote any.

In my configuration.nix I have:
   environment.systemPackages = with pkgs; [
     wget
     firefoxWrapper
     wineUnstable
     winetricks
     go
     xlibs.libX11
     SDL2
     SDL2_gfx
     SDL2_image
     SDL2_mixer
     SDL2_net
     dmd
     mercurial
     git
     pkgconfig
     gcc
     ...

[guest at nixos:~]$ ls -l $GOPATH
total 12
drwxr-xr-x 2 guest users 4096 Mar 17 23:46 bin
drwxr-xr-x 3 guest users 4096 Mar 17 23:26 pkg
drwxr-xr-x 4 guest users 4096 Mar 17 23:19 src

[guest at nixos:~]$ echo $GOPATH
/home/guest/go

[guest at nixos:~]$

Don't know if there is some package I can add to my
environment.systemPackages... or if I need some sophisticated nix
expression.