There's a peculiar problem of a missing dependency in app-office/kformula, which I'm not going to blame you guys for, because it's rather unintuitive and subopti- mal from KDE's end ;-). First of, KFormula will not start successfully when the fonts kioslave is unavailable; it will fail with the following error message: "Could not start process Unable to create io-slave: klauncher said: Unknown protocol 'fonts'." Unfortunately the fonts kioslave is not part of the kde-base/kdebase-kioslaves package, because it's not in the respective directory structure in the kdebase module as we ship it. Instead it's part of the KCon- trol package, because the slave is provided by the kfontinstall KControl module in the kcontrol/ dir. Thus KFormula needs to depend on kde-base/kcontrol to function. Reproducible: Always
And to lift your spirits: Debian has the same bug.
Fixed in CVS, thanks for reporting.