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towlower is defined by wctype.h --- a/src/multibyte.h +++ b/src/multibyte.h @@ -2,6 +2,7 @@ #ifdef MULTIBYTE #include <wchar.h> +#include <wctype.h> #define CHAR wchar_t #define STRLEN(s) wcslen(s) #define CPYSS(dest, src) wcscpy(dest, src) /* copy str to str */