SUMMARY

Not sure how do you build this project, but my experience shows that you missed some minor but annoying stuff. Look.

In ansihighlighter.cpp you missed including QStringBuilder, that leads to build errors with % operator.

In highlightingdata.cpp you have a line of code:

initRuleData(rule.data.anyChar, c.toLower() + c.toUpper());

that leads to build error qith unknown QChar + QChar operator. Fix is quite simple:

initRuleData(rule.data.anyChar, QString(c.toLower()) + c.toUpper());

Maybe you use some PCH? Maybe something else, but I use syntax-highlighting im my own project, and I was forced to make these small changes to build.