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-rw-r--r--m4/gnu-make.m419
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diff --git a/m4/gnu-make.m4 b/m4/gnu-make.m4
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+# Determine whether recent-enough GNU Make is being used.
+
+# Copyright (C) 2007, 2009-2016 Free Software Foundation, Inc.
+
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Paul Eggert.
+
+# Set GNU_MAKE if we are using a recent-enough version of GNU make.
+
+# Use --version AND trailing junk, because SGI Make doesn't fail on --version.
+
+AC_DEFUN([gl_GNU_MAKE],
+[
+ AM_CONDITIONAL([GNU_MAKE],
+ [${MAKE-make} --version /cannot/make/this >/dev/null 2>&1])
+])