Unable to compile on Solaris 2.5 with C++ 4.1

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : K.N.Srinivas
Your email address : knsini(at)india(dot)aspectdv(dot)com

System Configuration
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Architecture (example: Intel Pentium) : sun4m sparc SUNW,SPARCstation-20

Operating System (example: Linux 2.0.26 ELF) : SunOS 5.5

PostgreSQL version (example: PostgreSQL-6.4.2) : PostgreSQL-6.4.2

Compiler used (example: gcc 2.8.0) : C++ 4.1

Please enter a FULL description of your problem:
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Unable to compile on Solaris 2.5 with C++ 4.1

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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gmake -C preproc all
gmake[3]: Entering directory `/export/projects/intl/knsrini/postgresql-6.4.2/src/interfaces/ecpg/pre
/opt/SUNWspro/bin/cc -I../../../include -I../../../backend -I../include -DMAJOR_VERSION=2 -DMINON=4 -DPATCHLEVEL=4 -DINCLUDE_PATH=\"/usr/local/pgsql/include\" -c y.tab.c -o y.tab.o
lex pgc.l
"pgc.l":line 53: Error: missing translation value
gmake[3]: *** [pgc.c] Error 1
gmake[3]: Leaving directory `/export/projects/intl/knsrini/postgresql-6.4.2/src/interfaces/ecpg/prep
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory `/export/projects/intl/knsrini/postgresql-6.4.2/src/interfaces/ecpg'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory `/export/projects/intl/knsrini/postgresql-6.4.2/src/interfaces'
gmake: *** [all] Error 2

If you know how this problem might be fixed, list the solution below:
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