'math_unknown_function' => 'unknown function',
'math_lexing_error' => 'lexing error',
'math_syntax_error' => 'syntax error',
-'math_image_error' => 'PNG conversion failed;
-check for correct installation of latex, dvips, gs, and convert',
+'math_image_error' => 'PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert)',
'math_bad_tmpdir' => 'Cannot write to or create math temp directory',
'math_bad_output' => 'Cannot write to or create math output directory',
'math_notexvc' => 'Missing texvc executable; please see math/README to configure.',