app_osplookup.so: undefined symbol: OSPPInit

i compile asterisk1.4.2 and make install, make samples
when i run /usr/sbin/asterisk -vvvgc ,the follow string list:
/usr/sbin/asterisk: symbol lookup error: /usr/lib/asterisk/modules/app_osplookup.so: undefined symbol: OSPPInit.

if i noload app_osplookup.so, i can run asterisk.

My question is (1)what i should do to avoid the error, not noload app_osplookup.so
(2) if noload app_osplookup.so, what feature i will lose