openldap-2.0.7's configuration program tests for pthreads.  the test
program that normally succeeds segfaults with glibc-2.2-12.  went back to
2.2-9 and it's working again.  the test program is here (watch the line
wrapping though).  the included file condefs.h can be gotten from the
openldap-2.0.7 package.

pete

#include "confdefs.h"
/* pthread test headers */
#include <pthread.h>
#ifndef NULL
#define NULL (void*)0
#endif

static void *task(p)
        void *p;
{
        return (void *) (p == NULL);
}


int main(argc, argv)
        int argc;
        char **argv;
{

        /* pthread test function */
        pthread_t t;
        int status;
#if HAVE_PTHREADS_FINAL && defined(PTHREAD_CREATE_UNDETACHED)
        /* This system (e.g. AIX) defaults detached; must override */
        pthread_attr_t attr;

        status = pthread_attr_init(&attr);
        if( status ) exit( status );

        status =
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_UNDETACHED);
        if( status ) exit( status );

#define ATTR    &attr
#else
#if HAVE_PTHREADS_D4
#define ATTR    pthread_attr_default
#else
#define ATTR    NULL
#endif
#endif
        /* make sure pthread_create() isn't just a stub */
        status = pthread_create(&t, ATTR, task, NULL);
        if( status ) exit( status );

        /* make sure pthread_detach() isn't just a stub */
#if HAVE_PTHREADS_D4
        status = pthread_detach( &t );
#else
        status = pthread_detach( t );
#endif

#ifdef HAVE_LINUX_THREADS
        pthread_kill_other_threads_np();
#endif

        exit( status );

}