build: remove useless
if [ "$(uname)" == "Darwin" ]; then
# for Mac OSX
- export CXXFLAGS="${CXXFLAGS} -D_LIBCPP_DISABLE_AVAILABILITY -D_LIBCPP_USING_IF_EXISTS"
+ export CXXFLAGS="${CXXFLAGS} -D_LIBCPP_DISABLE_AVAILABILITY"
fi
mkdir build
