Hi,
enabling SNMP monitoring for Apache 2 is a little bit tricky,
the first error "/usr/local/apache2/bin/apxs not found" is easy to resolv. The binary is called apxs2 in Apache2, so either you create a symlink or you edit the build script build_apache_snmp.sh 2.0
Maybe you can also set the include-path in the scripts to your needs to fix the other errors
Mirko