if [[ -v DYLD_LIBRARY_PATH ]]; then
DYLD_LIBRARY_PATH+=":$HOME/lib"
else
DYLD_LIBRARY_PATH=$HOME/lib
fi
if [[ -v LIBRARY_PATH ]]; then
LIBRARY_PATH+=":$HOME/lib"
LIBRARY_PATH=$HOME/lib
export {DYLD_,}LIBRARY_PATH
mkdir -p ~/lib