xterm: format, add musl test (#384027)

pkgs/by-name/xt/xterm/package.nix

@@ -1,6 +1,18 @@
-{ lib, stdenv, fetchurl, xorg, ncurses, freetype, fontconfig
-, pkg-config, makeWrapper, nixosTests, gitUpdater
-, enableDecLocator ? true }:
+{
+  lib,
+  stdenv,
+  fetchurl,
+  xorg,
+  ncurses,
+  freetype,
+  fontconfig,
+  pkg-config,
+  makeWrapper,
+  nixosTests,
+  pkgsCross,
+  gitUpdater,
+  enableDecLocator ? true,
+}:
 
 stdenv.mkDerivation rec {
   pname = "xterm";
@@ -18,7 +30,11 @@ stdenv.mkDerivation rec {
 
   strictDeps = true;
 
-  nativeBuildInputs = [ makeWrapper pkg-config fontconfig ];
+  nativeBuildInputs = [
+    makeWrapper
+    pkg-config
+    fontconfig
+  ];
 
   buildInputs = [
     xorg.libXaw
@@ -48,13 +64,15 @@ stdenv.mkDerivation rec {
     "--with-app-defaults=$(out)/lib/X11/app-defaults"
   ] ++ lib.optional enableDecLocator "--enable-dec-locator";
 
-  env = {
-    # Work around broken "plink.sh".
-    NIX_LDFLAGS = "-lXmu -lXt -lICE -lX11 -lfontconfig";
-  } // lib.optionalAttrs stdenv.hostPlatform.isMusl {
-    # Various symbols missing without this define: TAB3, NLDLY, CRDLY, BSDLY, FFDLY, CBAUD
-    NIX_CFLAGS_COMPILE = "-D_GNU_SOURCE";
-  };
+  env =
+    {
+      # Work around broken "plink.sh".
+      NIX_LDFLAGS = "-lXmu -lXt -lICE -lX11 -lfontconfig";
+    }
+    // lib.optionalAttrs stdenv.hostPlatform.isMusl {
+      # Various symbols missing without this define: TAB3, NLDLY, CRDLY, BSDLY, FFDLY, CBAUD
+      NIX_CFLAGS_COMPILE = "-D_GNU_SOURCE";
+    };
 
   # Hack to get xterm built with the feature of releasing a possible setgid of 'utmp',
   # decided by the sysadmin to allow the xterm reporting to /var/run/utmp
@@ -78,6 +96,7 @@ stdenv.mkDerivation rec {
     tests = {
       customTest = nixosTests.xterm;
       standardTest = nixosTests.terminal-emulators.xterm;
+      musl = pkgsCross.musl64.xterm;
     };
 
     updateScript = gitUpdater {