Building default UnityScript in MonoDevelop fails

1. What happened
Created new JavaScript from Editor and opened it in MonoDevelop. Trying to build the project produced error 'Unrecognized #pragma directive'.

2. How we can reproduce it using the example you attached
- Open 'NewBehaviourScript.js' in MonoDevelop (shipped with the build on OSX)
- Try building the project
--->
Expected: the project gets build OK
Actual: Error appears 'Unrecognized #pragma directive'

Reproducible in 5.5.0b11, 5.4.2p4, 5.3.7p1. Not reproducible in 5.2.4p1