[Exim] Exim and AIX

Hello all,

I try to compile exim 4.20 under AIX 4.3.3 with ibmcxx 3.6.6 and I
obtain this error :

ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_destroy
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_lock
ld: 0711-317 ERROR: Undefined symbol: .pthread_cond_signal
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_unlock
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_trylock
ld: 0711-317 ERROR: Undefined symbol: .pthread_cond_wait
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutexattr_init
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutexattr_setpshared
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutex_init
ld: 0711-317 ERROR: Undefined symbol: .pthread_mutexattr_destroy
ld: 0711-317 ERROR: Undefined symbol: .pthread_condattr_init
ld: 0711-317 ERROR: Undefined symbol: .pthread_condattr_setpshared
ld: 0711-317 ERROR: Undefined symbol: .pthread_cond_init
ld: 0711-317 ERROR: Undefined symbol: .pthread_condattr_destroy
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more
information.
make: 1254-004 The error code from the last command is 8.


Stop.
make: 1254-004 The error code from the last command is 2.


Stop.

Thanks in advance,

Guy