GNAT GPL2011 for QNX is available on www.ajam.org.pl.
GPL2011 compiler relies on gcc4.5.3 along with changes implemented by AdaCore https://libre.adacore.com/libre/.  There 
are elements from gcc4.6 and gcc4.7 compilers.
To the correct work of compilers gcc4.5.3/g++4.5.3 and GNAT GPL2011 they are necessary gmp, mpfr, mpc, ppl libraries 
which I also put on my website.  
bogdan