Would this be a reasonable patch: --- wchar.h 19 Nov 2013 08:29:41 -0000 1.6 +++ wchar.h 16 Nov 2014 20:39:39 -0000 @@ -29,6 +29,7 @@ # define WEOF (0xffffffffu) #endif +#define _GLIBCXX_HAVE_MBSTATE_T 1 typedef struct { unsigned __opaque1, __opaque2; ? See also: /usr/lib/gcc/m68k-atari-mint/4.6.3/include/g++-v4/cwchar. -Helmut --