Example does not run ...

I compiled Seamonkey 1.0.5 on Linux and it runs fine.
Here is my .mozconfig:

------------
ac_add_options --enable-application=suite
mk_add_options MOZ_CO_PROJECT=suite
ac_add_options --enable-default-toolkit=gtk2
ac_add_options --enable-xft
ac_add_options --disable-tests
mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/obj-@CONFIG_GUESS@
--------------

Then I copied the JRex distro into mozilla/embedding/JRex
I changed the JRex.properties file to point at the
different objectdir:
moz_gre                 =./../../obj-i686-pc-linux-gnu/dist/gre
moz_bin                 =./../../obj-i686-pc-linux-gnu/dist/bin
jrex_gre                =./../../obj-i686-pc-linux-gnu/jrex_gre

Then I  run "ant" and "ant jrex_jre", both ended successfully.

When I do "ant run" I get the following jrex.err:

Exception in thread "main" org.mozilla.jrex.exception.JRexException
        at
org.mozilla.jrex.xpcom.JRexXPCOMImpl.startXPCOM(JRexXPCOMImpl.java:143)
        at org.mozilla.jrex.JRexFactory.startEngine(JRexFactory.java:222)
        at test.JRexExample.main(JRexExample.java:50)
Caused by: java.lang.UnsatisfiedLinkError: InitXPCOM
        at org.mozilla.jrex.xpcom.JRexXPCOMImpl.InitXPCOM(Native Method)
        at
org.mozilla.jrex.xpcom.JRexXPCOMImpl.access$200(JRexXPCOMImpl.java:45)
        at
org.mozilla.jrex.xpcom.JRexXPCOMImpl$1.run(JRexXPCOMImpl.java:173)

What is it I am missing here?

Cheers,
  Johann