initial glfw stuff working

nix/devshell.nix

@@ -1,14 +1,18 @@
 { mkShell, lib, stdenv
 
+, gdb
 , pkg-config
 , scdoc
 , zig
 
+, glfw
 , libX11
+, vulkan-headers
 }: mkShell rec {
   name = "ghostty";
 
   nativeBuildInputs = [
+    gdb
     pkg-config
     scdoc
     zig
@@ -16,6 +20,8 @@
 
   buildInputs = [
   ] ++ lib.optionals stdenv.isLinux [
+    glfw
     libX11
+    vulkan-headers
   ];
 }