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--- m4-1.4.16.orig/lib/freadahead.h 2011-03-01 17:39:27.000000000 +0100
+++ m4-1.4.16/lib/freadahead.h 2013-09-04 13:59:50.000000000 +0200
@@ -17,9 +17,6 @@
#include <stddef.h>
#include <stdio.h>
-#ifdef __cplusplus
-extern "C" {
-#endif
/* Assuming the stream STREAM is open for reading:
Return the number of bytes waiting in the input buffer of STREAM.
@@ -31,8 +28,25 @@ extern "C" {
STREAM must not be wide-character oriented. */
+
+#if HAVE___FREADAHEAD || (defined(__linux__) && !defined(__GLIBC__) && !defined(__UCLIBC__)) /* musl libc */
+#ifndef HAVE___FREADAHEAD
+#define HAVE___FREADAHEAD 1
+#endif
+
+#include <stdio_ext.h>
+#define freadahead(stream) __freadahead (stream)
+
+#else
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
extern size_t freadahead (FILE *stream);
#ifdef __cplusplus
}
#endif
+
+#endif
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