Funny, if you managed to checkout the source from the KDE SVN you won't need this info here but...

In order to compile and install kaudiocreator 1.12 on your system, type the following in the base directory of the kaudiocreator 1.12 distribution:

% ./configure
% make
% make install

Since kaudiocreator 1.12 uses autoconf and automake you should have no trouble compiling it. Should you run into problems please report them to the KDE mailing lists.