The file Imake.tmpl contains the following definitions:
FAMILY, indicating the target family (x86, usparc, ppc60x, mpc860, mpc8260).
COMPILER, indicating the compiler to be used (gcc, for example).
REL_DIR, indicating the path of the current directory. This variable is automatically set in subdirectories by imake.
HOSTOS, indicating the host operating system (solaris, win32).
DEVTOOLS_DIR, indicating the path of the ChorusOS tools.