>>>>> Henri Gomez writes: Henri> I'm trying to build the gcc 4.0 on V5R3 via PASE using the UCLA gcc Henri> 3.3.4 (which is reported to be for powerpc-ibm-aix5.1.0.0. Henri> I understand that PASE on V5R3 is an AIX 5.2. Henri> gcc 3.3.4 from UCLA report : Henri> Reading specs from /usr/local/lib/gcc-lib/powerpc-ibm-aix5.1.0.0/3.3.4/specs Henri> Configured with: ../gcc-3.3.4/configure --disable-nls Henri> Thread model: aix Henri> gcc version 3.3.4 Henri> I'm now trying with : Henri> ../gcc-4.0.0/configure --build=powerpc-ibm-aix5.1.0.0 Henri> --host=powerpc-ibm-aix5.1.0.0 --target=powerpc-ibm-aix5.2.0.0 --build and --host refer to the system, not the toolchain. If you are building on PASE that corresponds to AIX 5.2 and the compiler will be run on the same system, you should say powerpc-ibm-aix5.2.0.0 for all three configuration parameters. David