building problems

I have a problem with compiling on solaris2.9

just got ftp://ftp.mozilla.org/pub/mozilla.org/mozilla/nightly/latest-trunk/mozilla-source.tar.gz

fails here

[snippetty snip ------8<-----]
cd src; /opt/csw/bin/gmake real_install
gmake[6]: Entering directory `/tmp/mozilla/obj-sparc-sun-solaris2.9/nsprpub/pr/src'
rm -f libnspr4.a
echo not_ar cr libnspr4.a ./prvrsion.o io/./prfdcach.o io/./prmwait.o io/./prmapopt.o io/./priometh.o io/./pripv6.o 
io/./prlayer.o io/./prlog.o io/./prmmap.o io/./prpolevt.o io/./prprf.o io/./prscanf.o io/./prstdio.o threads/./prcmon.o 
threads/./prrwlock.o threads/./prtpd.o linking/./prlink.o malloc/./prmem.o md/./prosdep.o memory/./prshm.o 
memory/./prshma.o memory/./prseg.o misc/./pralarm.o misc/./pratom.o misc/./prcountr.o misc/./prdtoa.o misc/./prenv.o 
misc/./prerr.o misc/./prerror.o misc/./prerrortable.o misc/./prinit.o misc/./prinrval.o misc/./pripc.o misc/./prlog2.o 
misc/./prlong.o misc/./prnetdb.o misc/./prolock.o misc/./prrng.o misc/./prsystem.o misc/./prthinfo.o misc/./prtpool.o 
misc/./prtrace.o misc/./prtime.o malloc/./prmalloc.o pthreads/./ptsynch.o pthreads/./ptio.o pthreads/./ptthread.o 
pthreads/./ptmisc.o md/unix/./unix.o md/unix/./unix_errors.o md/unix/./uxproces.o md/unix/./uxrng.o md/unix/./uxshm.o 
md/unix/./uxwrap.o md/unix/./solaris.o md/unix/./os_SunOS.o
not_ar cr libnspr4.a ./prvrsion.o io/./prfdcach.o io/./prmwait.o io/./prmapopt.o io/./priometh.o io/./pripv6.o 
io/./prlayer.o io/./prlog.o io/./prmmap.o io/./prpolevt.o io/./prprf.o io/./prscanf.o io/./prstdio.o threads/./prcmon.o 
threads/./prrwlock.o threads/./prtpd.o linking/./prlink.o malloc/./prmem.o md/./prosdep.o memory/./prshm.o 
memory/./prshma.o memory/./prseg.o misc/./pralarm.o misc/./pratom.o misc/./prcountr.o misc/./prdtoa.o misc/./prenv.o 
misc/./prerr.o misc/./prerror.o misc/./prerrortable.o misc/./prinit.o misc/./prinrval.o misc/./pripc.o misc/./prlog2.o 
misc/./prlong.o misc/./prnetdb.o misc/./prolock.o misc/./prrng.o misc/./prsystem.o misc/./prthinfo.o misc/./prtpool.o 
misc/./prtrace.o misc/./prtime.o malloc/./prmalloc.o pthreads/./ptsynch.o pthreads/./ptio.o pthreads/./ptthread.o 
pthreads/./ptmisc.o md/unix/./unix.o md/unix/./unix_errors.o md/unix/./uxproces.o md/unix/./uxrng.o md/unix/./uxshm.o 
md/unix/./uxwrap.o md/unix/./solaris.o md/unix/./os_SunOS.o
: libnspr4.a
../../config/./nsinstall -t -m 0755 ./libnspr4.a ./libnspr4.so /tmp/mozilla/obj-sparc-sun-solaris2.9/dist/sdk/bin/
../../config/./nsinstall: cannot access ./libnspr4.a: No such file or directory
gmake[6]: *** [real_install] Error 1
gmake[6]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9/nsprpub/pr/src'
gmake[5]: *** [real_install] Error 2
gmake[5]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9/nsprpub/pr'
gmake[4]: *** [real_install] Error 2
gmake[4]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9/nsprpub'
gmake[3]: *** [libs] Error 2
gmake[3]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9/config'
gmake[2]: *** [tier_0] Error 2
gmake[2]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9'
gmake[1]: *** [default] Error 2
gmake[1]: Leaving directory `/tmp/mozilla/obj-sparc-sun-solaris2.9'
gmake: *** [build] Error 2
[----------->8---------------]

I'm actually making sunbird.... but it's on NSPR so I guess it's too early in build process to start discriminating?

using .mozconfig thus

#!/bin/bash
# Build configuration script
#
# See http://www.mozilla.org/build/unix.html for build instructions.
#

. $topsrcdir/calendar/sunbird/config/mozconfig

# Options for client.mk.
mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/obj-@CONFIG_GUESS@

# END MOZCONFIG

any ideas anyone?

cheers and kindest regards

Rob