The following bug has been logged online:

Bug reference: 1679
Logged by: Haluk GUNCER
Email address: halukguncer@hotmail.com
PostgreSQL version: 7.3.10 to 8.0.3
Operating system: HP UX B.11.11
Description: Error while compiling (linking), finite, Unsatisfied
symbols
Details:

/usr/ccs/bin/ld -r -o SUBSYS.o fmgrtab.o adt/SUBSYS.o cache/SUBSYS.o
error/SUBSY
S.o fmgr/SUBSYS.o hash/SUBSYS.o init/SUBSYS.o misc/SUBSYS.o mmgr/SUBSYS.o
sort/S
UBSYS.o time/SUBSYS.o mb/SUBSYS.o
gmake[3]: Leaving directory
`/home/postgres/postgresql-7.3.10/src/backend/utils'
gcc -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations
-Wl,+b -Wl,/usr/local/pgsql/lib -Wl,-z -Wl,-E access/SUBSYS.o
bootstrap/SUBSYS.
o catalog/SUBSYS.o parser/SUBSYS.o commands/SUBSYS.o executor/SUBSYS.o
lib/SUBSY
S.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/SUBSY
S.o utils/SUBSYS.o -lc -lPW -lgen -lBSD -ldld -lnsl -lm -o postgres
/usr/ccs/bin/ld: Unsatisfied symbols:
finite (first referenced in utils/SUBSYS.o) (code)
collect2: ld returned 1 exit status

I have a work around:
I put code
#undef HAVE_FINITE
to
.../src/backend/utils/adt/float.c
then it can link for each version. 7.3.10 to 8.0.3

note : I did not try prior versions.

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