whilc compiling mod_security I got:
checking for libapu config script… no
configure: *** apu library not found.
it took me about 5 min to figure out what the libapu was: lib-apr-util
so the following fixed it:
./configure –with-apxs=/etc/httpd/bin/apxs –with-apr=/etc/httpd/bin/apr-config –with-apu=/etc/httpd/bin/apu-config –with-lua