IBM® XL C/C++ for Linux®, V10.1 supports these operating systems supported by IBM Power Systems® servers: Red Hat Enterprise Linux 5.2 (RHEL 5.2) and SUSE Linux Enterprise Server 10 SP 2 (SLES10 SP2)..
The compiler no longer supports the __C99_COMPLEX_HEADER__ macro.
For a complete list of the predefined macros for XL C/C++, see Compiler predefined macros.