Hi All I was able to go further from the last time on compiling gcc 4.2.3 on AIX 5.3. However, I get the following error and the make aborts xgcc: error trying to exec '/cots/gnu/gcc-4.2.3/host-powerpc-ibm-aix5.3.0.0/gcc/as': execv: No such file or directory "as" is present and is a shell script calling /usr/bin/as. When I try to execute the above line from command line too I get the same error. I am running this in bash and using the AIX native as which is in /usr/bin/as Any ideas as to why this should happen? Appreciate your inputs and advice. With Regards Vardhan