1 files changed, 5 insertions, 1 deletions
diff --git a/build.py b/build.py
index d60c503..a4fd63f 100644
--- a/build.py
+++ b/build.py
@@ -667,7 +667,8 @@ class CustomTarget:
                     'output' : True,
                     'command' : True,
                     'install' : True,
-                    'install_dir' : True}
+                    'install_dir' : True,
+                    'build_always' : True}
     def __init__(self, name, subdir, kwargs):
         self.name = name
         self.subdir = subdir
@@ -740,6 +741,9 @@ class CustomTarget:
                 raise InvalidArguments('"install_dir" must be a string.')
         else:
             self.install = False
+        self.build_always = kwargs.get('build_always', True)
+        if not isinstance(self.build_always, bool):
+            raise InvalidArguments('Argument build_always must be a boolean.')
 
     def get_basename(self):
         return self.name