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-rw-r--r--src/libutil/util.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index d49067dfe2c7..0d39ffee9eae 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -131,6 +131,8 @@ void printMsg_(Verbosity level, const format & f);
 
 void warnOnce(bool & haveWarned, const format & f);
 
+extern void (*writeToStderr) (const unsigned char * buf, size_t count);
+
 
 /* Wrappers arount read()/write() that read/write exactly the
    requested number of bytes. */