title: Geant4 does not find Expat library
body: <p>I'm trying to install Geant4 10.00 on Linux Mint 15. I have the unzipped geant4 file geant4.10.00.p01 in the directory I made:</p>
  
  <p>/home/mickmau5/Geant4</p>
  
  <p>along with the required build file geant4.10.00-build. 
  This site goes throught the installation process <a href="http://goo.gl/nzxpQG" rel="nofollow">http://goo.gl/nzxpQG</a> . I'm at the lengthy cmake command part and getting this error</p>
  
  <pre><code>mickmau5@linuxmint ~/Geant4/geant4.10.00-build $ cmake -DCMAKE_INSTALL_PREFIX=/home/mickmau5/Geant4/geant4.10.00.p01-install /home/mickmau5/Geant4/geant4.10.00.p01
  CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:97 (message):
    Could NOT find EXPAT (missing: EXPAT_LIBRARY EXPAT_INCLUDE_DIR)
  Call Stack (most recent call first):
    /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:291 (_FPHSA_FAILURE_MESSAGE)
    /usr/share/cmake-2.8/Modules/FindEXPAT.cmake:50 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
    cmake/Modules/Geant4OptionalComponents.cmake:71 (find_package)
    CMakeLists.txt:78 (include)
  
  
  -- Configuring incomplete, errors occurred!
  </code></pre>
  
  <p>Seems like I ought to download some things.</p>
  
  <p>Thanks for any help!</p>