nice cursors for urxvt

0-install

nix-build -E 'with import <nixpkgs> {}; rxvt_unicode.overrideAttrs (o: {patches = [(builtins.fetchurl https://gist.githubusercontent.com/lheckemann/a613f7eaf19b5fdd8b490ff7019de134/raw/bae5dccf7c5fdf20bec44ad337f0f20ebcd91495/urxvt-nice-cursors.patch)] ++ o.patches or []; buildInputs = [xorg.libXcursor] ++ o.buildInputs or []; nativeBuildInputs = [autoreconfHook] ++ o.nativeBuildInputs or [];})'

urxvt-nice-cursors.patch

diff --git a/configure.ac b/configure.ac
index 0da3b59..df0f69a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -469,6 +469,12 @@ if test x$support_frills = xyes; then
   ], [:])
 fi
 
+RXVT_CHECK_MODULES([XCURSOR], [xcursor], [
+  X_LIBS="$XCURSOR_LIBS $X_LIBS"
+  CPPFLAGS="$CPPFLAGS $XCURSOR_CFLAGS"
+  AC_DEFINE(HAVE_XCURSOR, 1, Define to enable Xcursor support)
+], [:])
+
 dnl# --------------------------------------------------------------------------
 dnl# CHECKING FOR HEADER FILES
 dnl# --------------------------------------------------------------------------
diff --git a/src/init.C b/src/init.C
index 5a96603..91ae5c3 100644
--- a/src/init.C
+++ b/src/init.C
@@ -49,6 +49,10 @@
 # include <X11/Xmu/CurUtil.h>
 #endif
 
+#ifdef HAVE_XCURSOR
+# include <X11/Xcursor/Xcursor.h>
+#endif
+
 #ifdef HAVE_XSETLOCALE
 # define X_LOCALE
 # include <X11/Xlocale.h>
@@ -1421,7 +1425,11 @@ rxvt_term::create_windows (int argc, const char *const *argv)
     }
 #endif
 
-  TermWin_cursor = XCreateFontCursor (dpy, shape);
+#ifdef HAVE_XCURSOR
+  TermWin_cursor = XcursorLibraryLoadCursor (dpy, "xterm");
+#else
+  TermWin_cursor = XCreateFontCursor(dpy, shape);
+#endif
 
   /* the vt window */
   vt = XCreateSimpleWindow (dpy, top,