glibc 2.1 build

Linux glibc 2.1

What's missing/wrong to cause this during build?

gcc -o postgres access/SUBSYS.o bootstrap/SUBSYS.o catalog/SUBSYS.o
commands/SUB
SYS.o executor/SUBSYS.o lib/SUBSYS.o libpq/SUBSYS.o main/SUBSYS.o
parser/SUBSYS.
o nodes/SUBSYS.o optimizer/SUBSYS.o port/SUBSYS.o postmaster/SUBSYS.o
regex/SUBS
YS.o rewrite/SUBSYS.o storage/SUBSYS.o tcop/SUBSYS.o utils/SUBSYS.o
../utils/ver
sion.o -lcrypt -lnsl -ldl -lm -lncurses -export-dynamic
/usr/lib/libdl.a(dlsym.o): In function `doit.2':
dlsym.o(.text+0x22): undefined reference to `_dl_default_scope'
dlsym.o(.text+0x4c): undefined reference to `_dl_default_scope'
make[1]: *** [postgres] Error 1
make[1]: Leaving directory `/usr/src/postgresql-6.5.1/src/backend'
make: *** [all] Error 2