This is for Fortran. Please advice for ADA too. 
Got this error :-  g77: installation problem, cannot exec `as': No such file or directory 

when followed the below links and those files I installed 

1] http://www.ajam.org.pl/
gcc4.6.1-x86-qnx6.5.0-bld1.tar.bz2

2] http://www.opal-rt.com/kb-article/how-compile-fortran-code-qnx-61-632-or-650
g77-rtp6.1-files-010921.tgz 

3] http://hintsforums.macworld.com/archive/index.php/t-62445.html

searched  for 'as' in /usr/qnx650/host/x86/usr/bin 

and at that to PATH  /usr/qnx650/host/x86/usr/bin

'as' is assembler  but its missing there and also in  root/usr/bin
 
# echo $PATH
/sbin:/usr/sbin:/bin:/usr/bin:/usr/photon/bin:/usr/photon/appbuilder:/opt/X11R6/
bin:/usr/X11R6/bin:/usr/local/bin:/opt/bin:/opt/sbin

# uname -a
QNX localhost 6.5.0 2010/07/09-14:43:25EDT x86pc x86

# qconfig
$QNX_CONFIGURATION not set, -d not given, and/or /etc/qnx/qconfig doesn't exist.

snaps and add.f file is in zip file attached