rosetta compilation error

I am trying to build rosetta on a cluster that is running SUSE 2.6.16
I use scons supplied with the rosetta 3.4 package.
In rosetta_source I run this command: external/scons-local/scons.py bin mode=release

At first everything seems to be working, it keeps on compiling for 1 hour and then I get the message below.
Any idea what could have gone wrong ?

Jarek

g++ -o build/src/release/linux/2.6/64/x86/gcc/4.1/libutility.so -Wl,-rpath=/home/jarek/rosetta/rosetta_source/build/external/release/linux/2.6/64/x86/gcc/4.1/ -shared build/src/release/linux/2.6/64/x86/gcc/4.1/utility/pointer/ReferenceCount.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/pointer/ReferenceCountMI_.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/options/mpi_stderr.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/options/OptionCollection.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/tag/Tag.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/sql_database/DatabaseSessionManager.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/boinc/boinc_util.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/io/icstream.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/io/izstream.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/io/ocstream.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/io/ozstream.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/options/keys/OptionKeys.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/excn/Exceptions.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/json_spirit/json_spirit_reader.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/json_spirit/json_spirit_value.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/json_spirit/json_spirit_writer.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/file/file_sys_util.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/file/FileName.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/file/gzip_util.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/file/PathName.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/basic_sys_util.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/exit.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/heap.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/inline_file_provider.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/integer_mapping.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/LexicographicalIterator.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/mpi_util.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/PyExitCallback.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/static_database.os build/src/release/linux/2.6/64/x86/gcc/4.1/utility/string_util.os -Lexternal/lib -Lbuild/src/release/linux/2.6/64/x86/gcc/4.1 -Lsrc -Lbuild/external/release/linux/2.6/64/x86/gcc/4.1 -Lexternal -L/usr/lib -L/usr/local/lib -lObjexxFCL -lz -lcppdb -lsqlite3
/usr/lib64/gcc/x86_64-suse-linux/4.1.2/../../../../x86_64-suse-linux/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
scons: *** [build/src/release/linux/2.6/64/x86/gcc/4.1/libutility.so] Error 1
scons: building terminated because of errors.