[Asterisk-Users] asterisk version 0.7.1

[amna saleem]

dear list,
I am using asterisk version 0.7.1,and asterisk-oh323 version
0.5.10.Both are installed successfully,and I can see the configuration
file in asterisk directory.But when I changed the file h323.conf
,asterisk doesnot start..it gives the error
booting.....asterisk:relocation error:
/usr/lib/asterisk/modules/res_features.so: undefined symbol
ast_pthread_create
please can anyone tell me what is the problem????