/usr/include/sys/limits.h
You have to change some of the standard header files supplied with your version of Interactive. You also need to change some of the include files in the gcc-lib/include directory.
Let us say the gcc-files are in directory
/usr/local/lib/gcc-lib/i[345]86-isc[34].[0-9]/2.6.x
referred to as "gcc-lib"
/usr/include/sys/limits.h
/usr/include/sys/ioctl.h
/usr/include/errno.h
/usr/include/rpc/types.h
/usr/include/sys/un.h
/usr/include/math.h
/usr/include/sys/limits.h