installed to ~/test/release/Qt5.6.0/.
In ~/test/release/debug/ I ran
../Qt5.6.0/5.6/Src/configure -opensource -confirm-license -qtnamespace Bogosity -debug
which reported (inter alia - see attached config.txt)
Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
PATH=/usr/lib/icecc/bin:$PATH make -k -j24
failed with assorted linker errors, see attached make.txt (resulting from a second run of make, with less extraneous output).
Adding -static to the configure line causes significantly more linker failures.