solaris compIilation problem

Good evening (well is is evening in my part of the world),

I am just in the process of attempting to upgrade from

mod_ssl-2.8.25-1.3.34
to
mod_ssl-2.8.28-1.3.37

(along with upgrading openssl to the latest version) on solaris 2.9 with sun
cc.

I'm getting the following compilation error:

cc -c  -I../../os/unix -I../../include   -DSOLARIS2=290 -DMOD_SSL=208128
-DEAPI -DNO_DL_NEEDED
-I/opt/apps/src/apache_perl/solaris/apache_1.3.37/src/modules/ssl
-I/opt/apps/rte-1.1.6/include  `../../apaci` -DSSL_COMPAT -DSSL_ENGINE
-I/opt/apps/rte-1.1.6/include -DMOD_SSL_VERSION=\"2.8.28\" ssl_expr_scan.c
"lex.ssl_expr_yy.c", line 1900: syntax error before or at: 1
"lex.ssl_expr_yy.c", line 1901: warning: parameter mismatch: 1 declared, 0
defined
"lex.ssl_expr_yy.c", line 1903: warning: improper pointer/integer
combination: arg #1
"lex.ssl_expr_yy.c", line 1903: warning: improper pointer/integer
combination: arg #1
"lex.ssl_expr_yy.c", line 1904: cannot recover from previous errors
cc: acomp failed for ssl_expr_scan.c
make[6]: *** [ssl_expr_scan.o] Error 2
make[5]: *** [all] Error 1


Any advice how to get round this?

Many thanks

Michael