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