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See https://bugs.gentoo.org/935126
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -894,6 +894,7 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
#ifdef _MSC_VER
#include <inttypes.h>
/* See page about "Parameter Validation" on msdn.microsoft.com.
@@ -1708,6 +1709,7 @@ AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
#include <signal.h>
#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#if HAVE_SNPRINTF
# define my_snprintf snprintf
#else
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