Great build system, i have never used qmake, and don't know about if it supports defining toolchains like the ones for Android and iOS. But this one does!
My favorite cross-platform build system by a country mile. I just love the output from the Makefile when compiling. Very simple, color-coded, human-readable output. And its progress notifications during compilation are irreplaceable (especially for large projects) so much so that I even use CMake for my Qt projects.