Ocaml and pthread_atfork()

[Tony Breeds]

Hi All,
    Firstly I apologize if this is noise.  I elected to not file a
bugzilla as the problem seems to be powerpc specific and with the limited
resources for Fedora developers it would seem unfair.

I was recently trying to build a "current" libguestfs from the f16
branch[1].  During the build I hit:

(extracted from rpmbuild)

[tony@sneetch ~]$ bash -x  tmp/ocaml-test.sh 
+ cd rpmbuild/BUILD/libguestfs-1.16.9/ocaml/
+ LD_LIBRARY_PATH=../src/.libs
+ ocamlfind ocamlc -g -warn-error CDEFLMPSUVYZX -I . -package unix,threads -thread -linkpkg mlguestfs.cma t/guestfs_070_threads.cmo -o t/guestfs_070_threads.bc
File "_none_", line 1, characters 0-1:
Error: Error on dynamically loaded library: /usr/lib64/ocaml/stublibs/dllthreads.so: /usr/lib64/ocaml/stublibs/dllthreads.so: undefined symbol: pthread_atfork

I did a quick bit of googling and found:
http://ryanarn.blogspot.com.au/2011/07/curious-case-of-pthreadatfork-on.html

which seems to explain what's going on to my naive eye anyway.

I've tried a few different CFLAGS/patches to
otherlibs/systhreads/Makefile to try and induce pthreads_atfork() to be
resolved and linked during the ocaml build.  Nothing I try works.

Does anyone have any ideas on how to solve this?

I'm happy to do the heavy lifting I just don't have the background in
ocaml to solve this by myself.

Yours Tony

[1] I suspects that as a result of the demotion to secondary and things
    languishing there we skipped a few builds.