Bug Report: 7.1.3 initdb fails on FreeBSD 4.4-RELEASE/Alpha

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Jeff Duffy
Your email address : jeff(at)alanne(dot)com

System Configuration
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Architecture (example: Intel Pentium) : AlphaStation 225
("Avanti")

Operating System (example: Linux 2.0.26 ELF) : FreeBSD 4.4-RELEASE

PostgreSQL version (example: PostgreSQL-7.1.3): PostgreSQL-7.1.3

Compiler used (example: gcc 2.95.2) : gcc 2.95.3

Please enter a FULL description of your problem:
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PostgreSQL was compiled from source using the following flags:
--enable-syslog --prefix=/var/pgsql

After installation, attempting to perform an initdb as user postgres
with the command

$ /var/pgsql/bin/initdb -D /var/pgsql/data

produces the following output:

This database system will be initialized with username "postgres".
This user will own all the data files and must also own the server process.

Creating directory /var/pgsql/data
Creating directory /var/pgsql/data/base
Creating directory /var/pgsql/data/global
Creating directory /var/pgsql/data/pg_xlog
Creating template1 database in /var/pgsql/data/base/1
FATAL 2: control file context is broken

initdb failed.
Removing /var/pgsql/data.
Removing temp file /tmp/initdb.47749.
Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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Perform an initdb using a postgreSQL 7.1.3 installation on
FreeBSD 4.4-RELEASE/Alpha.