#if gcc >= 8 use std::filesystem instead of boost
ifeq ($(shell expr $(GCCVER) \>= 8), 1)
	override CXXFLAGS += -std=c++17
	ifeq ($(OS), Darwin)
		FS_LIBS=-lboost_system -lboost_filesystem
	else
		FS_LIBS=-lstdc++fs
	endif
else
	override CXXFLAGS += -std=c++14 -DUSE_BOOST_FS
	ifeq ($(OS), Linux)
		FS_LIBS=-lboost_system -lboost_filesystem
	else ifeq ($(OS), Darwin)
		FS_LIBS=-lboost_system -lboost_filesystem
	else
		FS_LIBS=-lboost_system-mt -lboost_filesystem-mt
	endif
endif