Ocaml 3.11.0 breaks Unison "ssh://"

[denis.laplante@…]

The major symptom was message 'Some error in create_session child' when trying to synchronize over ssh. The fix is to revert to ocaml version 3.10.2

From: Jerome Vouillon <Jerome.Vouillon@..>
Date: June 13, 2009 12:47:20 AM PDT (CA)
To: Denis Laplante <denis.laplante@..>
Subject: Re: 'Some error in create_session child'

DL> Bonjour
DL> 
DL> I get this message every time my MacPorts install of unison  
DL> @2.27.57_0+aqua
DL> tries to start ssh.  In fact "ls -lu /usr/bin/ssh" shows that ssh never 
DL> gets loaded.
DL> 
DL> Dtruss ( sudo /usr/bin/dtruss -f  Unison -debug verbose mac-via-ssh )
DL> shows that execve() after fork() fails with error 45 ( ENOSUP Not  
DL> supported).

JV> This is a bug in OCaml 3.11.0.  You should recompile Unison either
JV> with OCaml 3.11.1 or an older version of OCaml.
JV> 
JV> Thanks for this detailed report!

With ocaml 3.11.1 the following error occurs at compile time:

[ abbreviation: {} for "local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_net_unison/work/unison-2.27.57" ]
  /Developer/usr/bin/gcc-4.0 -arch i386 -L/opt/{}/uimacnew/build/Default -F/opt/{}/uimacnew/build/Default -F/opt/{}/uimacnew -filelist /opt/{}/uimacnew/build/uimac.build/Default/uimac.build/Objects-normal/i386/Unison.LinkFileList -mmacosx-version-min=10.5 /opt/{}/uimacnew/../unison-blob.o -L/opt/local/lib/ocaml -lunix -lthreadsnat -lstr -lasmrun -framework Cocoa -framework Security -framework Growl -framework ExceptionHandling -o /opt/{}/uimacnew/build/Default/Unison.app/Contents/MacOS/Unison
Undefined symbols:
 "_caml_apply2", referenced from:
     _caml_callback2_exn in libasmrun.a(i386.o)
 "_caml_apply3", referenced from:
     _caml_callback3_exn in libasmrun.a(i386.o)
ld: symbol(s) not found
collect2: ld returned 1 exit status