[ 92%] [ 92%] Built target handbook
[ 92%] Generating index.cache.bz2
Generating index.cache.bz2
warning: failed to load external entity "using-kmail.docbook"
index.docbook:198: parser error : Failure to process entity kmail-using-kmail
&kmail-using-kmail;
                   ^
index.docbook:198: parser error : Entity 'kmail-using-kmail' not defined
&kmail-using-kmail;
                   ^
make[2]: *** [docs/kdepim/kmail/index.cache.bz2] Error 1
make[1]: *** [docs/kdepim/kmail/CMakeFiles/handbook.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 92%] Built target handbook
make: *** [all] Error 2