I'm so sorry krizej

flake.nix

@@ -27,6 +27,7 @@
 
                     buildInputs = with pkgs; [
                         curl.dev
+                        xorg.libX11.dev
                     ];
                 };
             }

src/config.c

@@ -14,7 +14,7 @@ char *default_config_path(void) {
 
     char *config_dir = getenv("XDG_CONFIG_HOME");
     if (config_dir == NULL) {
-        char *home = getenv("$HOME");
+        char *home = getenv("HOME");
         if (asprintf(&config_dir, "%s/.config", home) < 0) {
             fprintf(stderr, "error: failed formatting config dir (this shouldn't happen)");
             exit(EXIT_FAILURE);