Port Bug Report: We cannot compile postgres due to a failure in yacc?

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Stephen Martin
Your email address : tigger(at)marketrends(dot)net

Category : install: compile
Severity : critical

Summary: We cannot compile postgres due to a failure in yacc?

System Configuration
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Operating System : Open BSD 2.3

PostgreSQL version : 6.4.2

Compiler used : gcc version 2.8.1

Hardware:
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64MB RAM,AMD-K6/2 300
OpenBSD svr2 2.3 GENERIC#6 i386

Versions of other tools:
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GNU Make version 3.76.1
flex version 2.5.4
lex version 2.5.4

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Problem Description:
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gmake[3]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend/optimizer/geqo'
ld -r -o SUBSYS.o path/SUBSYS.o plan/SUBSYS.o prep/SUBSYS.o util/SUBSYS.o geqo/SUBSYS.o
gmake[2]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend/optimizer'
gmake -C parser all
gmake[2]: Entering directory `/usr/local/src/pgsql/pgsql/src/backend/parser'
/usr/bin/yacc -d gram.y
/usr/bin/yacc: f - maximum table size exceeded
gmake[2]: *** [parse.h] Error 2
gmake[2]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend/parser'
gmake[1]: *** [parser.dir] Error 2
gmake[1]: Leaving directory `/usr/local/src/pgsql/pgsql/src/backend'
gmake: *** [all] Error 2

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Test Case:
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in the src directory
just attempt the initial build
with
gmake all

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Solution:
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