Unable to build on Solaris 2.6

Hi,

I am unable to build PostgreSQL 7.1.2 on Solaris 2.6.

Below are some info as to versions of the tools used and error messages.
Can anybody make something out of this?

Thank you

Peter

MAKE VERSION:
GNU Make version 3.77, by Richard Stallman and Roland McGrath.

GCC VERSION:
gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)

JUST THE BEGINNING OF A LONG OUTPUT OF ERROR MESSAGES:
[ws6709] /tmp/postgresql-7.1.2$ gmake
gmake -C doc all
gmake[1]: Entering directory `/tmp/postgresql-7.1.2/doc'
gmake[1]: Nothing to be done for `all'.
gmake[1]: Leaving directory `/tmp/postgresql-7.1.2/doc'
gmake -C src all
gmake[1]: Entering directory `/tmp/postgresql-7.1.2/src'
gmake -C backend all
gmake[2]: Entering directory `/tmp/postgresql-7.1.2/src/backend'
gmake -C access all
gmake[3]: Entering directory `/tmp/postgresql-7.1.2/src/backend/access'
gmake -C common SUBSYS.o
gmake[4]: Entering directory
`/tmp/postgresql-7.1.2/src/backend/access/common'
gcc  -Wall -Wmissing-prototypes -Wmissing-declarations
-I../../../../src/include   -c heaptuple
.c -o heaptuple.o
In file included from ../../../../src/include/access/tupdesc.h:18,
                 from ../../../../src/include/utils/rel.h:18,
                 from ../../../../src/include/storage/bufmgr.h:21,
                 from ../../../../src/include/storage/bufpage.h:18,
                 from ../../../../src/include/access/htup.h:17,
                 from ../../../../src/include/access/heapam.h:18,
                 from heaptuple.c:23:
../../../../src/include/catalog/pg_attribute.h:43: syntax error before `{'
../../../../src/include/catalog/pg_attribute.h:156: parse error before `}'
../../../../src/include/catalog/pg_attribute.h:156: warning: type defaults
to `int' in declarat
ion of `FormData_pg_attribute'
../../../../src/include/catalog/pg_attribute.h:156: warning: data definition
has no type or sto
rage class
../../../../src/include/catalog/pg_attribute.h:170: parse error before `*'
../../../../src/include/catalog/pg_attribute.h:170: warning: type defaults
to `int' in declarat
ion of `Form_pg_attribute'
../../../../src/include/catalog/pg_attribute.h:170: warning: data definition
has no type or sto
rage class
In file included from ../../../../src/include/utils/rel.h:18,