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Building emissions files

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New member
I'm so very new to WRF-Chem. I am trying to put together an emissions file and I am having great difficulty. I read through the emission file user guide. I have downloaded PREP-CHEM-SOURCE-1.5 and I cannot get it to compile. I have downloaded the zlib files and I keep getting an error that a file can't be created during compilation due to read only setting. However, the directory is my own project folder - which is not read only. I'm assuming I have some environment variable or compilation setting incorrect.

Please help! I'm a true novice and I don't know what to try next!
I dont know about prep-chem but you can also try out MOZART input emissions......