8.0.0 beta failed to build on mac os x

I googled a bit and it seems that this error is caused by global
variables that are either not initialized or not declared extern.

gcc -no-cpp-precomp -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations -D_REENTRANT -D_THREAD_SAFE
-D_POSIX_PTHREAD_SEMANTICS -I. -I../../../src/include
-I../../../src/port -DFRONTEND -c -o thread.o thread.c
ar crs libpq.a `lorder fe-auth.o fe-connect.o fe-exec.o fe-misc.o
fe-print.o fe-lobj.o fe-protocol2.o fe-protocol3.o pqexpbuffer.o
pqsignal.o fe-secure.o dllist.o md5.o ip.o wchar.o encnames.o noblock.o
pgstrcasecmp.o thread.o | tsort`
tsort: cycle in data
tsort: fe-exec.o
tsort: fe-protocol2.o
tsort: fe-connect.o
tsort: fe-protocol3.o
tsort: cycle in data
tsort: fe-exec.o
tsort: fe-protocol2.o
tsort: cycle in data
tsort: fe-exec.o
tsort: fe-misc.o
tsort: cycle in data
tsort: fe-auth.o
tsort: fe-connect.o
ranlib libpq.a
gcc -no-cpp-precomp -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations -D_REENTRANT -D_THREAD_SAFE
-D_POSIX_PTHREAD_SEMANTICS -dynamiclib -install_name
/Users/cclark/Desktop/pgsql/lib/libpq.3.dylib -compatibility_version 3
-current_version 3.2 -multiply_defined suppress fe-auth.o fe-connect.o
fe-exec.o fe-misc.o fe-print.o fe-lobj.o fe-protocol2.o fe-protocol3.o
pqexpbuffer.o pqsignal.o fe-secure.o dllist.o md5.o ip.o wchar.o
encnames.o noblock.o pgstrcasecmp.o thread.o -L../../../src/port
-lresolv -o libpq.3.2.dylib
ld: common symbols not allowed with MH_DYLIB output format with the
-multi_module option
fe-secure.o definition of common _thread_in_send (size 4)
/usr/bin/libtool: internal link edit command failed
make[3]: *** [libpq.3.2.dylib] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all] Error 2
make: *** [all] Error 2
CliffMac:~/Desktop/postgresql-8.0.0beta1 cclark$