Build glibmm fails with Solaris Forte C++ compiler

["simon zheng sun com" <Simon Zheng Sun COM>]

Hi Murray and All,

I fail to build glibmm 2.15.7 on Solaris. But it works well with 
previous V2.15.6. Current error message shows as below.

"
pkgbuild: "file.cc", line 2144: Error: Overloading ambiguity between 
"Glib::unwrap<Gio::File>(const Glib::RefPtr<const Gio::File>&)" and 
"Glib::unwrap<const Gio::File>(const Glib::RefPtr<const Gio::File>&)".
pkgbuild: "file.cc", line 2199: Error: Overloading ambiguity between 
"Glib::unwrap<Gio::File>(const Glib::RefPtr<const Gio::File>&)" and 
"Glib::unwrap<const Gio::File>(const Glib::RefPtr<const Gio::File>&)".
pkgbuild: "file.cc", line 2204: Error: Overloading ambiguity between 
"Glib::unwrap<Gio::File>(const Glib::RefPtr<const Gio::File>&)" and 
"Glib::unwrap<const Gio::File>(const Glib::RefPtr<const Gio::File>&)".
"
My compiler info is here.

bash-3.2$ cc -V     
cc: Sun C 5.8 Patch 121016-05 2007/01/10
usage: cc [ options] files.  Use 'cc -flags' for details
bash-3.2$
bash-3.2$ CC -V
CC: Sun C++ 5.8 Patch 121018-07 2006/11/01

I'm a C++ newer and have little knowledge with C++ template. Seem to 
unwrap unable to decide what's right type of parameter. How can I fix? 
Could you give me a hand?

Thanks a lot,
-Simon