In my .zshrc file I have existing exports for OpenSSL.

export LDFLAGS="-L/usr/local/opt/[email protected]/lib"
export CPPFLAGS="-I/usr/local/opt/[email protected]/include"
export PKG_CONFIG_PATH="/usr/local/opt/[email protected]/lib/pkgconfig"

Now I have to compile packages that require the zlib library. How can I add these flags without overwriting the previous?

I tried chaining them on with a : like is done for path, but that didn't seem to work, when I run ./configure it reading them as a single flag.

ld: warning: directory not found for option '-L/usr/local/opt/[email protected]/lib:-L/usr/local/opt/zlib/lib'

Can someone please advise on how to do this correctly?