Berkeley DB version 2.x and OpenLDAP running threads
====================================================

Special care has to be taken when building Berkeley DB 2.x
for use with OpenLDAP as an slapd backend.  If OpenLDAP is with
threads, so must Berkeley DB.   If OpenLDAP is built without
threads, so must Berkeley DB.

The configuration tool of Sleepycat's Berkeley DB will automatically
set appropriate options on IRIX, OSF/1, and SUN Solaris platforms
(version 2.3.16), as well as FreeBSD (version 2.6.4).  The options
must be manually defined on other plaforms, e.g. on LINUX.

On PC-LINUX (kernel version 2.0.35, linux kernel threads as imple-
mented by libpthreads.so.1.60.4) with gcc as the standard compiler
the environment variable CPPFLAGS must define -D_REENTRANT, while
building the Berkeley DB package.

DO NOT USE THE -ansi CFLAG, SINCE THEN THE DB PACKAGE'S CONFIGURE
CANNOT FIND THE X86/GCC SPINLOCKS, WHICH ARE NEEDED FOR THREAD-
SUPPORT WITH THE BERKELEY DB.

Please check carefully if your platform is not mentioned above.

The OpenLDAP configure tool will most probably find the correct
configuration itself.   No special action has to be taken
while building the OpenLDAP package.

Jan, 9th, 1999, /KSp (ksp@openldap.org)