On UnixWare force using CFLAGS="-O0 -g" for m4 and bison inststaed of -O2

[Boyd Lynn Gerber <gerberb%zenez.com@localhost>]

Hello,

On doing a bulk build on these packages I want to use CFLAGS=-O0 on 
first time configuration and build of these two packages m4 and bison.

When using CFLAGS="-O0 -g"
m4 passes all test.

without using the option it 4 tests fail and often fails with.
/usr/pkg/bin/gm4: internal error detected; please report this bug to
<bug-m4%gnu.org@localhost>: Segmentation Fault

Using bison
input/output error.

Only when configured CFLAGS="-O0 -g" on first configure.
bison passes all but 4 tests.

How do I force pkgsrc on these two packages to not use -O2 but -O0 when 
doing a bulk build?

Regards,

--
Boyd Gerber <gerberb%zenez.com@localhost> 801 849-0213
ZENEZ   1042 East Fort Union #135, Midvale Utah  84047