tdepim FTBFS on Slackware 13.37

Failure: ================================================== In file included from /dev/shm/tdepim/libkcal/icalformat.cpp:35:0: /usr/include/libical/icalss.h:38:27: fatal error: icalcomponent.h: No such file or directory compilation terminated. ================================================== /usr/include/libical/icalcomponent.h does exist. I reinstalled libical anyway. I just built tdepim on Slackware 13.1 with no such failure. Slackware 13.1: libical 0.43, gcc 4.4.4, cmake 2.8.4 Slackware 13.37: libical 0.4.4, gcc 4.5.2, cmake 2.8.4 I appreciate any help. Darrell