usingIrix = 0 usingLinux = 0 usingFreeBSD = 0 UNAME = $(shell uname | tr '[:upper:]' '[:lower:]') ifneq (, $(findstring irix, $(UNAME))) usingIrix = 1 endif ifneq (, $(findstring linux, $(UNAME))) usingLinux = 1 endif ifneq (, $(findstring freebsd, $(UNAME))) usingFreeBSD = 1 endif