nix/mk/platform.mk

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ifdef HOST_OS
HOST_KERNEL = $(firstword $(subst -, ,$(HOST_OS)))
ifeq ($(patsubst mingw%,,$(HOST_KERNEL)),)
HOST_MINGW = 1
HOST_WINDOWS = 1
endif
ifeq ($(HOST_KERNEL), cygwin)
HOST_CYGWIN = 1
HOST_WINDOWS = 1
HOST_UNIX = 1
endif
ifeq ($(patsubst darwin%,,$(HOST_KERNEL)),)
HOST_DARWIN = 1
HOST_UNIX = 1
endif
ifeq ($(patsubst freebsd%,,$(HOST_KERNEL)),)
HOST_FREEBSD = 1
HOST_UNIX = 1
endif
ifeq ($(patsubst netbsd%,,$(HOST_KERNEL)),)
HOST_NETBSD = 1
HOST_UNIX = 1
endif
ifeq ($(HOST_KERNEL), linux)
HOST_LINUX = 1
HOST_UNIX = 1
endif
ifeq ($(patsubst solaris%,,$(HOST_KERNEL)),)
HOST_SOLARIS = 1
HOST_UNIX = 1
endif
ifeq ($(HOST_KERNEL), gnu)
HOST_HURD = 1
HOST_UNIX = 1
endif
endif