slackware + openldap: could not locate usable POSIX Threads

[Yuri Nosyrev <nua@subscribe.slavel.ru>]

Hi, openldap-software users

slackware 10.2 with kernel 2.6.15.4
openldap-2.3.19

'configure' fails with:
...
checking OpenSSL library version (CRL checking capability)... yes
checking for _beginthread... no
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking POSIX thread version... 10
checking for LinuxThreads pthread.h... yes
checking for GNU Pth pthread.h... no
checking sched.h usability... yes
checking sched.h presence... yes
checking for sched.h... yes
checking for pthread_create in default libraries... no
checking for pthread link with -kthread... no
checking for pthread link with -pthread... no
checking for pthread link with -pthreads... no
checking for pthread link with -mthreads... no
checking for pthread link with -thread... no
checking for pthread link with -lpthread -lmach -lexc -lc_r... no
checking for pthread link with -lpthread -lmach -lexc... no
checking for pthread link with -lpthread -Wl,-woff,85... no
checking for pthread link with -lpthread... no
checking for pthread link with -lc_r... no
checking for pthread link with -threads... no
checking for pthread link with -lpthreads -lmach -lexc -lc_r... no
checking for pthread link with -lpthreads -lmach -lexc... no
checking for pthread link with -lpthreads -lexc... no
checking for pthread link with -lpthreads... no
configure: error: could not locate usable POSIX Threads

$ su root -c "ldconfig -p | grep pth"
libpthread.so.0 (libc6, hwcap: 0x8000000000000000, OS ABI: Linux 2.6.4) 
=> /lib/tls/libpthread.so.0
libpthread.so.0 (libc6, OS ABI: Linux 2.4.1) => /lib/libpthread.so.0
libpth.so.20 (libc6) => /usr/local/lib/libpth.so.20
libpth.so (libc6) => /usr/local/lib/libpth.so

$ ls -la /lib | grep pth
-rwxr-xr-x 1 root root 80929 2005-09-11 08:05 libpthread-0.10.so*
lrwxrwxrwx 1 root root 18 2005-12-18 08:58 libpthread.so.0 -> 
libpthread-0.10.so*

$ ls -la /usr/lib | grep pth
-rw-r--r-- 1 root root 125238 2005-09-11 08:05 libpthread.a
-rw-r--r-- 1 root root 216 2005-09-11 06:51 libpthread.so
-rw-r--r-- 1 root root 1344 2005-09-11 08:05 libpthread_nonshared.a
-rw-r--r-- 1 root root 130048 2005-09-11 08:05 libpthread_p.a

Other Linux distos (like my workstation's FC4) have no problems with 
running openldap's 'configure'

Any ideas? Thanks in advance

--
Best Regards,
Yuri Nosyrev			mailto: nua at slavel dot ru