From bb5239471d3628e79dc44fa3345a052f88199eeb Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Mon, 08 Oct 2012 21:06:41 -0400
Subject: Use clean macro names in makefiles.

---
(limited to 'configure')

diff --git a/configure b/configure
index 5b9daf7..b9ddeb9 100755
--- a/configure
+++ b/configure
@@ -309,6 +309,7 @@ write_makefiles()
 	# Make a script to edit input makefiles.
 	_sed_script=''
 	for _var in ${subst_vars}; do
+		_var="$(printf '%s' "${_var}" | tr -c '[a-z0-9]' '_')"
 		_sed_script="${_sed_script}s&@${_var}@&$(eval echo \$\{"${_var}"\})&g;"
 	done
 
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