ifeq ($(V), 1)
Q =
else
Q = @
endif

TARGET_OS ?= $(shell uname)
ifeq ($(TARGET_OS),)
  TARGET_OS ?= $(OS)
endif

ifneq (,$(filter Windows%,$(TARGET_OS)))
LIBLZ4 = liblz4-$(LIBVER_MAJOR)
LIBLZ4_EXP = liblz4.lib
WINBASED   = yes
else
LIBLZ4_EXP = liblz4.dll.a
  ifneq (,$(filter MINGW%,$(TARGET_OS)))
LIBLZ4     = liblz4
WINBASED   = yes
  else
    ifneq (,$(filter MSYS%,$(TARGET_OS)))
LIBLZ4     = msys-lz4-$(LIBVER_MAJOR)
WINBASED   = yes
    else
      ifneq (,$(filter CYGWIN%,$(TARGET_OS)))
LIBLZ4     = cyglz4-$(LIBVER_MAJOR)
WINBASED   = yes
      else
LIBLZ4     = liblz4.$(SHARED_EXT_VER)
WINBASED   = no
EXT        =
      endif
    endif
  endif
endif

ifeq ($(WINBASED),yes)
EXT        = .exe
WINDRES    = windres
endif

#determine if dev/nul based on host environment
ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell uname)))
VOID := /dev/null
else
  ifneq (,$(filter Windows%,$(OS)))
VOID := nul
  else
VOID  := /dev/null
  endif
endif

ifneq (,$(filter Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku MidnightBSD MINGW% CYGWIN% MSYS%,$(shell uname)))
POSIX_ENV = Yes
else
POSIX_ENV = No
endif

# Avoid symlinks when targetting Windows or building on a Windows host
ifeq ($(WINBASED),yes)
LN_S  = cp -p
LN_SF = cp -p
else
  ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell uname)))
LN_S  = cp -p
LN_SF = cp -p
  else
    ifneq (,$(filter Windows%,$(OS)))
LN_S  = cp -p
LN_SF = cp -p
    else
LN_S   = ln -s
LN_SF  = ln -sf
    endif
  endif
endif

ifneq (,$(filter $(shell uname),SunOS))
INSTALL ?= ginstall
else
INSTALL ?= install
endif

INSTALL_PROGRAM ?= $(INSTALL) -m 755
INSTALL_DATA    ?= $(INSTALL) -m 644
INSTALL_DIR     ?= $(INSTALL) -d -m 755