this is a friendly warning! if you're not familiar with opensource build procedures of common components and hacking things to get them working, don't bother trying to build zimbra. the third party build is difficult, depending on the platform you're building on and any documentation i've seen is out of date and/or platform specific. the main build process is generally straight forward, depends on state of the source tree, which itself is currently quite out of date.
for example the snmp you're building is very out of date and the actual zimbra source tree uses a newer version. you'll come across many of these difficulties on a build. unless you have a really good reason to build from source I would save you the pain and say run a binary
