OS_AIX=$(shell expr "$(UNAME)" : '.*AIX.*')
OS_SUNOS=$(shell expr "$(UNAME)" : '.*SunOS.*')
OS_DARWIN=$(shell expr "$(UNAME)" : '.*Darwin.*')
OS_AIX=$(shell expr "$(UNAME)" : '.*AIX.*')
OS_SUNOS=$(shell expr "$(UNAME)" : '.*SunOS.*')
OS_DARWIN=$(shell expr "$(UNAME)" : '.*Darwin.*')