Port Bug Report: connecting with psql v. 6.4.2 kill 6.5 backend!

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Palle Girgensohn
Your email address : girgen(at)partitur(dot)se

Category : runtime: back-end
Severity : critical

Summary: connecting with psql v. 6.4.2 kill 6.5 backend!

System Configuration
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Operating System : FreeBSD 3.2-STABLE

PostgreSQL version : 6.5

Compiler used : gcc-2.7.2.1

Hardware:
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pentium 128 MB,
FreeBSD stordatan.palle.se 3.2-STABLE FreeBSD 3.2-STABLE #0: Thu Jul 8 05:41:27 CEST 1999 root(at)stordatan(dot)palle(dot)se:/usr/src/sys/compile/PALLE3 i386

Versions of other tools:
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gmake...

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Problem Description:
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When connecting to the a 6.5 postmaster from another host
with 6.4.2 installed, the backend dies:

ERROR: postmaster: getprotobyname failed
Segmentation fault (core dumped)

a backtrace from gdb:
(gdb) bt
#0 0x281d0b23 in siglongjmp () from /usr/lib/libc.so.3

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Test Case:
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install & run postgres 6.4.2 on one machine
install & run postgres 6.5 on another

pg-6.4.2$ psql -h pg-6.5

BOOM

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Solution:
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