make[3]: Entering directory `/home/rad182/ktorrent-2.1/plugins/search'
/bin/sh ../../libtool --silent --mode=link --tag=CXX g++ -Wno-long-long -Wundef -ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -O2 -Wformat-security -Wmissing-format-attribute -Wno-non-virtual-dtor -fno-exceptions -fno-check-new -fno-common -fexceptions -o ktsearchplugin.la -rpath /usr/lib/kde3 -module -avoid-version -module -no-undefined -Wl,--no-undefined -Wl,--allow-shlib-undefined -R /usr/lib -R /opt/kde/lib -R /usr/lib/qt/lib -R /usr/X11/lib -L/opt/kde/lib -L/usr/lib/qt/lib -L/usr/X11/lib searchplugin.lo htmlpart.lo searchwidget.lo searchprefpage.lo searchtab.lo searchenginelist.lo searchbar.lo searchpref.lo searchtabbase.lo searchpluginsettings.lo ../../libktorrent/libktorrent.la -lkhtml -lkparts -lqt-mt -lz -lpng -lz -lm -lXext -lX11 -lSM -lICE -lpthread -lkdecore -lkdeui -lkio
/usr/lib/gcc/i486-slackware-linux/3.4.6/../../../../i486-slackware-linux/bin/ld: cannot find -lacl
collect2: ld returned 1 exit status
make[3]: *** [ktsearchplugin.la] Error 1
make[3]: Leaving directory `/home/rad182/ktorrent-2.1/plugins/search'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/rad182/ktorrent-2.1/plugins'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/rad182/ktorrent-2.1'
make: *** [all] Error 2

any ideas?

Find a library named acl and install that.

Note if you are compiling, I would advise you to use the 2.1 release.