BUG #1584: undefined symbol _tas

The following bug has been logged online:

Bug reference:      1584
Logged by:          Benjamin Reed
Email address:      ranger@befunk.com
PostgreSQL version: 7.3.9
Operating system:   Mac OS X 10.4.0 ("Tiger")
Description:        undefined symbol _tas
Details:

Something has changed between 10.3 and 10.4; my PostgreSQL 7.3.9 Fink
package builds just fine on 10.3, but fails on 10.4 with:

gcc -no-cpp-precomp -g -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations -fno-common
-L/sw/build/root-postgresql73-7.3.9-21/sw/lib -L/sw/lib  -L/sw/lib
-L/usr/lib   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 -lpam -lkrb5 -lz -lreadline -lresolv -ldl -lm
-o postgres
/usr/bin/ld: warning -L: directory name
(/sw/build/root-postgresql73-7.3.9-21/sw/lib) does not exist
/usr/bin/ld: Undefined symbols:
_tas

I've found some references to similar issues, but have been unable to figure
out how to apply them to the current situation.