OS_CYGWIN=$(shell expr "$(UNAME)" : '.*CYGWIN.*')
OS_LINUX=$(shell expr "$(UNAME)" : '.*Linux.*')
OS_LINUX64=$(shell expr "$(UNAME_A)" : '.*Linux.*x86_64.*')
OS_CYGWIN=$(shell expr "$(UNAME)" : '.*CYGWIN.*')
OS_LINUX=$(shell expr "$(UNAME)" : '.*Linux.*')
OS_LINUX64=$(shell expr "$(UNAME_A)" : '.*Linux.*x86_64.*')