I got an error while compiling Apache today:

”./configure”
”–enable-auth-digest”
”–enable-deflate”
”–enable-rewrite”
”–enable-so”
”–enable-vhost-alias”
”–disable-userdir”
”–enable-mime-magic”

configure: error: mod_deflate has been requested but can not be built due to prerequisite failures

I fixed this by installing zlib from source.