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--- src/output.c.orig 2007-07-05 03:56:06.000000000 +0000
+++ src/output.c 2007-12-12 03:48:25.000000000 +0000
@@ -254,2 +254,8 @@
"Warning: cannot protect diversion across forks"));
+ /* POSIX states that it is undefined whether an append stream starts
+ * at offset 0 or at the end. We want the beginning.
+ */
+ else if (fseeko (file, 0, SEEK_SET) != 0)
+ M4ERROR ((EXIT_FAILURE, errno,
+ "cannot seek to beginning of diversion"));
return file;
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