The package of XInput2.h header file cannot be found on nixos

Question content

I have been trying to build some go projects that use the X11 library and am trying to build https://github.com/npmaile/ I encountered this error when using PapeChanger/.

45 | #include <X11/extensions/Xinerama.h>
   |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Whenever this happens, I usually just look in nix-pkgs for a package usually named "xorg.lib", or in this case the "xorg.libXinerama" package. This usually works fine, but on a few recent projects I've run into this error.

48 | #include <X11/extensions/XInput2.h>
   |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

When trying to find this library, I can't seem to find its package anywhere.

I tried xorg.xinput and found out that it is a program and not a library. I tried looking everywhere on the nix-pkgs website for this library but found nothing. As a sanity check, I did some searching to see if it was a thing and found this page in the xorg documentation as well as the fedora wiki page about the library.

What I am looking for is the packaging method of Xinput2. It looks like a pretty core component, so I can't imagine it isn't.

Correct answer

The file comes from the "dev" output of the xorg.libXi fork in nixpkgs. Here are some commands I ran to confirm when checking out the nixpkgs repository:

$ nix-build -A xorg.libXi.dev
/nix/store/qrs00hnv9frpk49rbp6dir3vqw0my8j7-libXi-1.8-dev
$ ls result-dev/include/X11/extensions
XInput2.h  XInput.h

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