Hi Kyrre, Solaris does not support C99 wide string manipulation. Building GCC itself detects that lack of support, and disables wide string support. Note: Solaris does support C++98 wide string manipulation, but the GCC test looks for C99 compliance, which has a few additional functions. The problem is in detection for (and the missing of) vfwscanf, vswscanf, vwscanf, wcstof and (perhaps) iswblank. qv... <http://www.cygwin.com/ml/cygwin/2002-11/msg00920.html> <http://www.mail-archive.com/gcc-bugs@xxxxxxxxxxx/msg43724.html> <http://www.geocrawler.com/archives/3/356/2001/11/1050/6963066/> <http://gcc.gnu.org/ml/libstdc++/2003-09/txt00002.txt> <http://gcc.gnu.org/ml/gcc-patches/2003-09/msg01830.html> Assuming that this hasn't been fixed in the GCC head, I believe you need to doctor up the acinclude.m4 file and rebuild GCC to get C++ std::wstring support in GCC on Solaris. HTH, --Eljay