Our app invokes some binary executables (imagine `convert image.png`).
In order to make deployment error free, I'd like to include them in our
source tree, and add the paths to the ENV['PATH'] dynamically.

Is there a cross platform way of doing this?  Unix uses ':' as a path
separator, Windows uses ';'.

In case you're wondering how the binaries can be cross platform.
Imaging:
/vendor/bin/i386-linux/
/vendor/bin/i386-mswin32/
require 'rbconfig'
add_to_path('vendor/bin/' + Config::CONFIG['arch'] + '/')

Not sure how to compile cross Linux binaries, though - they're often
dependent on the distro and even version.  Is it enough to compile them
statically linked?

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