1 files changed, 21 insertions, 0 deletions
diff --git a/m4/isatty.m4 b/m4/isatty.m4
new file mode 100644
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+++ b/m4/isatty.m4
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+# isatty.m4 serial 2
+dnl Copyright (C) 2012 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.
+
+AC_DEFUN([gl_FUNC_ISATTY],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  dnl On native Windows, the system's isatty(), defined as an alias of _isatty()
+  dnl in the "oldnames" library, returns true for the NUL device.
+  case $host_os in
+    mingw*) REPLACE_ISATTY=1 ;;
+  esac
+])
+
+# Prerequisites of lib/isatty.c.
+AC_DEFUN([gl_PREREQ_ISATTY], [
+  AC_REQUIRE([AC_C_INLINE])
+])