open xchange "make" fehler :(

Hallo,
wollte gerade open xchange Installen .. aber bei make kommt nun dieser fehler:
[javac] symbol : class HttpSession
[javac] location: class com.openexchange.umin.myDataGroupware
[javac] private void showMyData(HttpServletRequest req,HttpServletResponse res,HttpSession session,ResourceBundle i18n,HashMap dyndata)
[javac] ^
[javac] /root/open-xchange-0.8.2/src/com/openexchange/umin/myDataGroupware.java:222: cannot resolve symbol
[javac] symbol : class HttpSession
[javac] location: class com.openexchange.umin.myDataGroupware
[javac] private void fillData(HttpSession session,HashMap dyndata){
[javac] ^
[javac] /root/open-xchange-0.8.2/src/com/openexchange/umin/myDataPasswd.java:55: package javax.servlet does not exist
[javac] import javax.servlet.ServletException;
[javac] ^
[javac] /root/open-xchange-0.8.2/src/com/openexchange/umin/myDataPasswd.java:56: package javax.servlet.http does not exist
[javac] import javax.servlet.http.HttpServletRequest;
[javac] ^
[javac] /root/open-xchange-0.8.2/src/com/openexchange/umin/myDataPasswd.java:57: package javax.servlet.http does not exist
[javac] import javax.servlet.http.HttpServletResponse;
[javac] ^
[javac] /root/open-xchange-0.8.2/src/com/openexchange/umin/myDataPasswd.java:58: package javax.servlet.http does not exist
[javac] import javax.servlet.http.HttpSession;
[javac] ^
[javac] 100 errors

BUILD FAILED
/root/open-xchange-0.8.2/build.xml:45: Compile failed; see the compiler error output for details.

Total time: 9 seconds
make[1]: *** [java] Error 1
make[1]: Leaving directory `/root/open-xchange-0.8.2/javabuild'
make: *** [all-recursive] Error 1
SERVER:~/open-xchange-0.8.2 #