Not compatible with Python 3 yet.
Import chemeq-2.12 as wip/chemeq.

chemeq is a chemical equation analyzer. It is a fast lexical and
syntaxic analyser which helps to find out chemical informations
embedded in source chemical equations. Data can be output in various
sophisticated formats, depending on options. 'chemeq' defaults to
'chemeq -mlcwCn'
Fix SMF support by not overwriting INSTALLATION_DIRS.