POSIX threads - pthread.h problem with configure on Solaris 7

[Banzaitron <banzaitron@adelphia.net>]

I am trying to build openldap on a Solaris 7 box, and I am running into a
problem with the POSIX thread library apparently.  I am getting the
following error from configure:

Copyright 1998-2002 The OpenLDAP Foundation,  All Rights Reserved.
        Restrictions apply, see COPYRIGHT and LICENSE files.
Copyright 1998-2002 The OpenLDAP Foundation,  All Rights Reserved.
        Restrictions apply, see COPYRIGHT and LICENSE files.
Configuring OpenLDAP 2.1.4-Release ...
checking host system type... sparc-sun-solaris2.7
checking target system type... sparc-sun-solaris2.7
checking build system type... sparc-sun-solaris2.7
checking for a BSD compatible install... build/shtool install -c
checking whether build environment is sane... yes
checking for mawk... no
checking for gawk... no
checking for nawk... nawk
checking whether make sets ${MAKE}... yes
checking for working aclocal... missing
checking for working autoconf... missing
checking for working automake... missing
checking for working autoheader... missing
checking for working makeinfo... missing
checking for gnutar... no
checking for gtar... no
checking for tar... tar
checking configure arguments... done
checking for a BSD compatible install... build/shtool install -c
checking for cc... cc
checking for ar... ar
checking for Cygwin environment... no
checking for mingw32 environment... no
checking for EMX OS/2 environment... no
checking how to run the C preprocessor... cc -E
checking for gcc... (cached) cc
checking whether the C compiler (cc   ) works... yes
checking whether the C compiler (cc   ) is a cross-compiler... no

{lines skipped}

checking for _beginthread... no
checking for pthread.h... yes
checking POSIX thread version... final
checking for LinuxThreads pthread.h... no
checking for GNU Pth pthread.h... no
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

Apparently I have the pthreads lib, but not a 'usable' one.  Does anyone
know where I can find a usable pthreads library?

Thanks,
Andy Hofle