Building DavMail is quite simple:

• Make sure you have Java 6 or 7 installed and set as current version by checking JAVA_HOME:
  
  • Unix/OSX: echo $JAVA_HOME
  • Windows: echo %JAVA_HOME%
• Check if you already have Apache Ant installed :
  ant -version
  If you don't, download and unzip ant from ant.apache.org, add ant/bin full path to the PATH environment variable.
• Get DavMail source package from sourceforge and uncompress it: tar xvzf davmail-src-*.tgz
  or checkout trunk: svn co https://svn.code.sf.net/p/davmail/code/trunk
  or get and uncompress tarball from https://sourceforge.net/p/davmail/code/HEAD/tree/trunk
• Additional steps on Windows:
  • Download and install NSIS from http://nsis.sourceforge.net
  • Make sure NSIS install path (C:\Program Files\NSIS) is available in system path
  • Then get KillProcess plugin from http://www.esanu.name/software/index.php/nsis-kill-process/ or the nsis directory in DavMail source.
  • Copy the processwork.dll library to NSIS plugin directory.
• Go into davmail directory root directory (which contains the build.xml file) and type: ant

Packages are then available under dist