return (fp->_flags & __SWR) != 0;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
return (fp->_flag & _IOWRT) != 0;
+#elif defined __UCLIBC__ /* uClibc */
+ return (fp->__modeflags & __FLAG_WRITING) != 0;
#else
#error "Please port gnulib fwriting.c to your platform!"
#endif