FYI, trying a test on Linux with Neko installed in a non-standard location results in the error:
... flow / build - running haxe ... Standard library not found
Even though I had set
I worked around this by creating a symlink to the default location:
sudo ln -s /path/to/my/neko /usr/lib/neko
Then it worked fine. I'm not sure if this is a Flow problem, a Haxe problem, or just my environment.