diff -ru libunistring-0.9.9.orig/lib/fseterr.c libunistring-0.9.9/lib/fseterr.c
--- libunistring-0.9.9.orig/lib/fseterr.c	2018-02-28 17:07:03.000000000 +0100
+++ libunistring-0.9.9/lib/fseterr.c	2018-08-15 16:40:53.419266090 +0200
@@ -1,20 +1,11 @@
 /* Set the error indicator of a stream.
    Copyright (C) 2007-2018 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or
-   modify it under the terms of either:
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
-     * the GNU Lesser General Public License as published by the Free
-       Software Foundation; either version 3 of the License, or (at your
-       option) any later version.
-
-   or
-
-     * the GNU General Public License as published by the Free
-       Software Foundation; either version 2 of the License, or (at your
-       option) any later version.
-
-   or both in parallel, as here.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ -32,13 +23,17 @@
 
 #include "stdio-impl.h"
 
+/* This file is not used on systems that have the __fseterr function,
+   namely musl libc.  */
+
 void
 fseterr (FILE *fp)
 {
   /* Most systems provide FILE as a struct and the necessary bitmask in
      <stdio.h>, because they need it for implementing getc() and putc() as
      fast macros.  */
-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+  /* GNU libc, BeOS, Haiku, Linux libc5 */
   fp->_flags |= _IO_ERR_SEEN;
 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
   /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
diff -ru libunistring-0.9.9.orig/lib/fseterr.h libunistring-0.9.9/lib/fseterr.h
--- libunistring-0.9.9.orig/lib/fseterr.h	2018-02-28 17:07:03.000000000 +0100
+++ libunistring-0.9.9/lib/fseterr.h	2018-08-15 16:40:53.419266090 +0200
@@ -1,20 +1,11 @@
 /* Set the error indicator of a stream.
    Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc.
 
-   This program is free software: you can redistribute it and/or
-   modify it under the terms of either:
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
-     * the GNU Lesser General Public License as published by the Free
-       Software Foundation; either version 3 of the License, or (at your
-       option) any later version.
-
-   or
-
-     * the GNU General Public License as published by the Free
-       Software Foundation; either version 2 of the License, or (at your
-       option) any later version.
-
-   or both in parallel, as here.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the