lang/gcc34 seems to be broken on Solaris 10, need help

[Raymond Meyer <raymond.meyer%rambler.ru@localhost>]

Hi, I'm trying to build lang/gcc34 (C, C++ and Fortran compilers) on Solaris
10, after compiling for a while, it stops with the following error message:

creating libtool
updating cache ./config.cache
configure: loading cache ./config.cache
checking how to run the C++ preprocessor... cpp
configure: error: C++ preprocessor "cpp" fails sanity check
See `config.log' for more details.
gmake[1]: *** [configure-target-libstdc++-v3] Error 1
gmake[1]: Leaving directory `/opt/pkg.obj/lang/gcc34/work.ultra10-lan/obj'
gmake: *** [bootstrap] Error 2
*** Error code 2

Stop.
bmake: stopped in /opt/pkgsrc/lang/gcc34


Checking
/opt/pkg.obj/lang/gcc34/work.ultra10-lan/obj/sparc-sun-solaris2.10/libstdc+
+-v3/config.log 

I see the following errors:

configure:4698: checking how to run the C++ preprocessor
configure:4812: result: cpp
configure:4836: cpp -O2 -O3 -mcpu=ultrasparc -mvis -mv8plus -pipe -I/opt/pkg.obj
/lang/gcc34/work.ultra10-lan/.buildlink/include -I/opt/pkg/include -I/usr/includ
e conftest.cc
cpp: installation problem, cannot exec `cc1plus': No such file or directory
configure:4842: $? = 1
configure: failed program was:
| /* confdefs.h.  */
| 
| #define PACKAGE_NAME "package-unused"
| #define PACKAGE_TARNAME "libstdc++"
| #define PACKAGE_VERSION "version-unused"
| #define PACKAGE_STRING "package-unused version-unused"
| #define PACKAGE_BUGREPORT ""
| #ifdef __cplusplus
| extern "C" void exit (int);
| #endif
| /* end confdefs.h.  */
| #ifdef __STDC__
| # include <limits.h>
| #else
| # include <assert.h>
| #endif
|                    Syntax error


So I ran the following command manually, because I assume that is the cpp which
is called by configure script

# /opt/pkg.obj/lang/gcc34/work.ultra10-lan/obj/gcc/stage2/cpp /tmp/conftest.cc
cpp: installation problem, cannot exec `cc1plus': No such file or directory

Does anyone know what would be a proper fix to this?