Your shell can't find make in the PATH variable. Solution(s): Give which make and locate make a try.
If any of these shell commands returns a location, add it to the path variable by using set path=$PATH:/location/found/by/you or export path=$PATH:/location/found/by/you.
The code differences depend on the kind of shell you use.
If the above doesn't work... you might need to install the SUN development tools/packages.