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Fix -Wundef warning.  Addressed upstream as part of this commit:
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commit 888c679ba406e89d86bdfbde033e307f5af5198f
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date:   Thu Jul 10 14:24:30 2014 +0530
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    Sync up error.c with gnulib
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diff --git a/misc/error.c b/misc/error.c
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index 6fb192da4b38a4f9..3d0156e406fa1539 100644
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--- a/misc/error.c
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+++ b/misc/error.c
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@@ -100,7 +100,7 @@ print_errno_message (int errnum)
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 #if defined HAVE_STRERROR_R || _LIBC
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   char errbuf[1024];
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-# if STRERROR_R_CHAR_P || _LIBC
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+# if _LIBC || STRERROR_R_CHAR_P
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   s = __strerror_r (errnum, errbuf, sizeof errbuf);
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 # else
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   if (__strerror_r (errnum, errbuf, sizeof errbuf) == 0)