We should only depend on GLib on the libmm-glib headers. Otherwise,
packages using just the core headers (e.g. ModemManagerQt) would also
need to build-depend on GLib and we don't want to enforce that.
cd ~/buildroot/output/build/kde-modemmanager-qt-v5.36.0/src && ~/buildroot/output/host/usr/bin/arm-cortexa9_neon-linux-gnueabihf-g++ .... -fPIC -o CMakeFiles/KF5ModemManagerQt_static.dir/bearer.cpp.o -c ~/buildroot/output/build/kde-modemmanager-qt-v5.36.0/src/bearer.cpp
In file included from ~/buildroot/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/usr/include/ModemManager/ModemManager.h:41:0,
from ~/buildroot/output/build/kde-modemmanager-qt-v5.36.0/src/generictypes.h:27,
from ~/buildroot/output/build/kde-modemmanager-qt-v5.36.0/src/generictypes.cpp:23:
~/buildroot/output/host/usr/arm-buildroot-linux-gnueabihf/sysroot/usr/include/ModemManager/ModemManager-compat.h:23:18: fatal error: glib.h: No such file or directory
compilation terminated.