Feel free to fork and send me pull requests to help me update the grammar rules quickly :)
Contact: arnov@udel.edu, http://crpl.cis.udel.edu/
Update September, 2017 : Still working on the regex to improve the syntax highlighting.
Future Releases:
Syntax highlighting for OpenACC in atom.
Post installation of package:
Press 'ctrl+shift+l' and select OpenACC-C
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.