Add, forgotten in last commit.

diff --git a/m4/unistd_h.m4 b/m4/unistd_h.m4
new file mode 100644 (file)
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+++ b/m4/unistd_h.m4
@@ -0,0 +1,18 @@
+# unistd_h.m4 serial 1
+dnl Copyright (C) 2006 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Written by Simon Josefsson
+
+AC_DEFUN([gl_UNISTD],
+[
+  dnl Prerequisites of lib/unistd.h.
+  AC_CHECK_HEADERS([unistd.h], [
+    UNISTD_H=''
+  ], [
+    UNISTD_H='unistd.h'
+  ])
+  AC_SUBST(UNISTD_H)
+])