Konqueror Plugins is part of the KDE project http://www.kde.org/.
Konqueror Plugins can be found in the kdeaddons package on ftp://ftp.kde.org/pub/kde/, the main FTP site of the KDE project.
You should install the kdebase package which contains Konqueror before attempting to compile this package.
In order to compile and install Konqueror Plugins on your system, type the following in the base directory of the Konqueror Plugins distribution:
% ./configure % make % make install
Since Konqueror Plugins uses autoconf and automake you should have no trouble compiling it. Should you run into problems please report them to the KDE mailing lists.