Build error due to docs

[Thorsten Zachmann]

Hello,

I have the following build error since I updated today. It still compiled 
yesterday without problems.

[  0%] Built target TestKoUnit_automoc
index.docbook:24: parser error : Entity 'calligra' not defined
    in the &calligra; productivity suite.
                     ^
index.docbook:42: parser error : Entity 'calligra' not defined
<para>&kexi; is part of the &calligra; productivity suite for KDE.
                                      ^
make[2]: *** [doc/kexi/index.cache.bz2] Error 1
make[1]: *** [doc/kexi/CMakeFiles/kexi-handbook.dir/all] Error 2

Thorsten