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I'm not very familiar with Linux or running programs via the shell, but following Daniel Shiffman's tutorial series, I wrote a sketch which outputs a PNG and posts it to Twitter. The sketch was exported as a Linux application and runs in headless mode on my server. However, an almost identical method for another sketch doesn't seem to run at all and I'm not sure where the problem lies.
When inspecting the files in Linux, my terminal colour codes one of the exported applications green (meaning an executable), but the non-functional one is coloured white (i.e. not recognised). This probably isn't a reliable means to debug, but could there be something in my sketch which is preventing it from exporting properly?
I've tried troubleshooting using the Wiki, but can't see anything which might be causing it. If anyone has experienced anything similar (or can see something glaring which I'm overlooking), I'd really appreciate some advice.
Full sketch code can be found here: https://github.com/CodeMacabre/obitbot/blob/master/tombstone/tombstone.pde