Ensure that system environment variable PATH includes the location of all the compilers mentioned above.

Set the environment variable OBJECT_MODE to 64.

Download the source code of ICU version 4.4 for C from http://site.icu-project.org/download

At the shell prompt, execute the following commands:

gunzip -d < icu4c-4_4-src.tgz | tar -xf -
cd icu/source
./runConfigureICU AIX --disable-threads --enable-renaming=no --with-library-bits=64 CC=xlc
gmake
gmake -k check
gmake install

Set the environment variable LIBPATH to point to the location of ICU. AIX uses the environment variable LIBPATH to search for dynamically linked libraries.