The package's slack-required file lists gambas-runtime >=2.15 | gambas >= 2.15
I believe the proper names are gambas2-runtime, etc., so the dependant isn't found.
Nice catch. Not that that helps you, sorry.
Someone should fix this, but you might work around it by choosing "continue anyway", then be sure to check the "download only" box after clicking "apply". Untar the package, fix the reference, repack the files. Install gambas2-runtime (gambas2 if you prefer) and install vcpufreq using upgradepkg --install-new /path/to/new/vcpufreq.pkg.tlz .
Better yet, post a request for the change to "New Package Requests", mentioning vcpufreq 2.2.0-i586-1vl60.
My guess is that most that're using cpufreq are using the xfce4 plugin, so the problem's not been both noticed and noted.