fakexrandr: mkdir for install (#29845)

var/spack/repos/builtin/packages/fakexrandr/package.py

@@ -44,3 +44,10 @@ def edit(self, spec, prefix):
 
         if 'platform=darwin' in spec:
             makefile.filter('ldconfig', '')
+
+    # In Makefile, install commands check the target dir.
+    # If it does not exist, process will stop.
+    @run_before('install')
+    def make_target_dir(self):
+        mkdirp(self.prefix.lib)
+        mkdirp(self.prefix.bin)