I'm not familiar with Bodhi, but there seems to be some sort of glitch in the dependency check somewhere since 2.8.12 is newer than 2.8.11 and it should accept it. It may require a specialized build of wxgtk or a suffix after the version (like some have 'ubuntu' afterwards).
Sorry I can't be of more help.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)