Squelch warnings about datarootdir.
diff --git a/Makefile.in b/Makefile.in
index 6a58717..d6bf0e4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -26,6 +26,10 @@
# Top level hierarchy
prefix = @prefix@
exec_prefix = @exec_prefix@
+# Root of the directory tree for read-only architecture-independent data
+# files. (We don't use it directly, but, in autoconf 2.60 and later,
+# other things we use are defined in terms of it.)
+datarootdir = @datarootdir@
# Pathname of directory to install the binary
sbindir = @sbindir@
# Pathname of directory to install the man page
