Help need to compile pgsql-r-v7.2

Hi,

I am Hemasekhar.I am trying to do postgresql replication on Linux using spread.I downloaded SPREAD and pgsql-r-v7.2 .I compiled and did make on spread-src-3.17.1.
when i tried to compile and make pgsql-r-v7.2,i am getting following error
sip(at)ssf pgsql-r-v7.2]$ make

make -C doc all

make[1]: Entering directory `/home/qsip/pgsql-r-v7.2/doc'

make[1]: Nothing to be done for `all'.

make[1]: Leaving directory `/home/qsip/pgsql-r-v7.2/doc'

make -C src all

...
.......
make[4]: Entering directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/misc'

make[4]: `SUBSYS.o' is up to date.

make[4]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/misc'

make -C mmgr SUBSYS.o

make[4]: Entering directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/mmgr'

make[4]: `SUBSYS.o' is up to date.

make[4]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/mmgr'

make -C sort SUBSYS.o

make[4]: Entering directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/sort'

make[4]: `SUBSYS.o' is up to date.

make[4]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/sort'

make -C time SUBSYS.o

make[4]: Entering directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/time'

make[4]: `SUBSYS.o' is up to date.

make[4]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/utils/time'

make[3]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/utils'

make -C replication all

make[3]: Entering directory `/home/qsip/pgsql-r-v7.2/src/backend/replication'

make[3]: Nothing to be done for `all'.

make[3]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend/replication'

gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -Wl,-rpath,/usr/local/pgsql/lib -export-dynamic access/SUBSYS.o bootstrap/SUBSYS.o catalog/SUBSYS.o parser/SUBSYS.o commands/SUBSYS.o executor/SUBSYS.o lib/SUBSYS.o libpq/SUBSYS.o main/SUBSYS.o nodes/SUBSYS.o optimizer/SUBSYS.o port/SUBSYS.o postmaster/SUBSYS.o regex/SUBSYS.o rewrite/SUBSYS.o storage/SUBSYS.o tcop/SUBSYS.o utils/SUBSYS.o replication/SUBSYS.o -lz -lcrypt -lresolv -lnsl -ldl -lm -lbsd -lreadline -ltermcap -L/home/qsip/spread -L/usr/local/lib/pth/ -lpthread -lspread -o postgres

/usr/bin/ld: cannot find -lspread

collect2: ld returned 1 exit status

make[2]: *** [postgres] Error 1

make[2]: Leaving directory `/home/qsip/pgsql-r-v7.2/src/backend'

make[1]: *** [all] Error 2

make[1]: Leaving directory `/home/qsip/pgsql-r-v7.2/src'

make: *** [all] Error 2

Please help me out why am i getting this error.I tried searching in the net,but i didn't get solution for the same.
Please help me out it's very Urgent.

Thanks and Regards
Hemasekhar