gcc i686 on x86_64 platform

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http://stackoverflow.com – I have some troubles to install GCC i686 on a RHEL X86_64. Indeed, I have to build some 32bit softwares and shared libraries on this platform. I can build these softwares and libraries on 32bit platforms (linux or windows). My questions are at the end of this post. My first problem was this error: (during a buil, under eclipse -helios) In file included from /usr/include/stdlib.h:314, from ../../../../../XXXX.h:19, from /XXXX.c:33: /usr/include/sys/types.h:150: error: duplicate 'unsigned' /usr/include/sys/types.h:151: error: duplicate 'unsigned' /usr/i (HowTos)