rcg requires /usr/src/linux
In file included from /var/cache/advligorts/rcg-3.4~rc1/src/fe/x1iopv/x1iopv.c:3:0:
/usr/share/advligorts/src/src/include/fe.h:4:59: fatal error: /usr/src/linux/arch/x86/include/asm/processor.h: No such file or directory
#include </usr/src/linux/arch/x86/include/asm/processor.h>
This directory is expected to be copy of the linux kernel source. On Debian systems this can be a link to the source from the common header package, e.g.:
/usr/src/linux -> /usr/src/linux-headers-3.2.0-rts-common
or
/usr/src/linux -> /usr/src/linux-headers-3.2.88-rts
The rcg should just find the correct source itself, and not expect this symlink to exist.