dblink make fails under postgresql 8.4.4 on mac osx 10.4.11

Having trouble installing dblink under PostgreSQL 8.4.4 on MAC OS X 10.4.11

Running make gives the following error:

sed 's,MODULE_PATHNAME,$libdir/dblink,g' dblink.sql.in >dblink.sql

gcc -no-cpp-precomp -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv  -I../../src/interfaces/libpq -I. -I../../src/include   -c -o dblink.o dblink.c

dblink.c: In function 'get_pkey_attnames':

dblink.c:1698: error: 'SnapshotNow' undeclared (first use in this function)

dblink.c:1698: error: (Each undeclared identifier is reported only once

dblink.c:1698: error: for each function it appears in.)

make: *** [dblink.o] Error 1

Does anyone know a fix to this?

Thanks for any help.

Gary