Port Bug Report: gmake all fails due to "buggy Flex"

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               : Gary Hoffman
Your email address      : ghoffman@ucsd.edu

Category                : install: compile
Severity                : critical

Summary: gmake all fails due to "buggy Flex"

System Configuration
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  Operating System   : BSDi 3.0

  PostgreSQL version : 6.0

  Compiler used      : gcc 2.7.2.1

Hardware:
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Dell 486/50 with 32M
BSD/OS saraband.ucsd.edu 3.0 BSDI BSD/OS 3.0 Kernel #0: Wed Apr 16 15:15:49 MDT
1997     polk@demiurge.BSDI.COM:/home/polk/sys-3.0patches/compile/GENERIC  i386


Versions of other tools:
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Flex 2.5.4a
GNU Make version 3.75


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Problem Description:
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Following instructions in Install Readme, I downloaded Flex 2.5.4a from mit.edu and compiled. Still, the make.log tells
me:
gmake lexverify
gmake[1]: Entering directory `/usr2/src/pgsql/src'
gmake -C lextest all
gmake[2]: Entering directory `/usr2/src/pgsql/src/lextest'
lex scan.l
gcc2 -c lex.yy.c
gcc2 -c lextest.c
gcc2 -o lextest lex.yy.o lextest.o
unexpected last match in input()
gmake[2]: Leaving directory `/usr2/src/pgsql/src/lextest'

You have a buggy version of flex.  Read INSTALL and search for flex for a fix.

gmake[1]: *** [lexverify] Error 1
gmake[1]: Leaving directory `/usr2/src/pgsql/src'
gmake: *** [all] Error 2

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Test Case:
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I followed step 14:

       14.     Compile the program. Type
         $ cd /usr/src/pgsql/src
         $ gmake all >& make.log &
         $ tail -f make.log


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Solution:
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