Fix pkg-config and Nix

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.19)
 
 set(HYPRLANG_VERSION "0.2.0")
 set(PREFIX ${CMAKE_INSTALL_PREFIX})
+set(INCLUDE ${CMAKE_INSTALL_INCLUDEDIR})
 
 project(hyprlang
     VERSION ${HYPRLANG_VERSION}

hyprlang.pc.in

@@ -1,9 +1,10 @@
-prefix="@PREFIX@"
-includedir="${prefix}/include"
+prefix=@PREFIX@
+includedir=@INCLUDE@
+libdir=${prefix}/lib
 
 Name: hyprlang
 URL: https://github.com/hyprwm/hyprlang
 Description: The official implementation library for the hypr config language.
 Version: @HYPRLANG_VERSION@
-Cflags: -I"${prefix}/include"
-libs: -lhyprlang
+Cflags: -I${includedir}
+Libs: -L${libdir} -lhyprlang

nix/default.nix

@@ -12,6 +12,8 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [cmake];
 
+  outputs = ["out" "dev"];
+
   meta = with lib; {
     homepage = "https://github.com/hyprwm/hyprlang";
     description = "The official implementation library for the hypr config language";