--- ./lib/stdio-impl.h.orig	2012-11-06 05:42:58.000000000 -0600
+++ ./lib/stdio-impl.h	2018-09-18 18:43:39.324058680 -0500
@@ -92,3 +92,10 @@
 # endif
 
 #endif
+
+/* Glibc 2.28 made _IO_IN_BACKUP private.  For now, work around this
+   problem by defining it ourselves.  FIXME: Do not rely on glibc
+   internals.  */
+#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN
+# define _IO_IN_BACKUP 0x100
+#endif
--- ./lib/freadahead.c.orig	2012-11-06 05:42:58.000000000 -0600
+++ ./lib/freadahead.c	2018-09-18 18:43:39.319058680 -0500
@@ -24,7 +24,7 @@
 size_t
 freadahead (FILE *fp)
 {
-#if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
   if (fp->_IO_write_ptr > fp->_IO_write_base)
     return 0;
   return (fp->_IO_read_end - fp->_IO_read_ptr)
--- ./lib/freadseek.c.orig	2012-11-06 05:42:58.000000000 -0600
+++ ./lib/freadseek.c	2018-09-18 18:43:39.322058680 -0500
@@ -34,7 +34,7 @@
 freadptrinc (FILE *fp, size_t increment)
 {
   /* Keep this code in sync with freadptr!  */
-#if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
   fp->_IO_read_ptr += increment;
 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
   fp_->_p += increment;
--- ./lib/fseterr.c.orig	2012-11-06 05:42:58.000000000 -0600
+++ ./lib/fseterr.c	2018-09-18 18:43:39.323058680 -0500
@@ -29,7 +29,7 @@
   /* 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_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
   fp->_flags |= _IO_ERR_SEEN;
 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
   fp_->_flags |= __SERR;
--- ./lib/freadptr.c.orig	2012-11-06 05:42:58.000000000 -0600
+++ ./lib/freadptr.c	2018-09-18 18:43:39.321058680 -0500
@@ -29,7 +29,7 @@
   size_t size;
 
   /* Keep this code in sync with freadahead!  */
-#if defined _IO_ferror_unlocked || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Linux libc5 */
   if (fp->_IO_write_ptr > fp->_IO_write_base)
     return NULL;
   size = fp->_IO_read_end - fp->_IO_read_ptr;