diff --git a/bld.sh b/bld.sh
index 1cedaa1d0..d61019a7c 100755
--- a/bld.sh
+++ b/bld.sh
@@ -6,15 +6,25 @@
 
 pushd editions/tw5.com > /dev/null
 
-echo "five.tiddlywiki.com" > ../../../jermolene.github.com/CNAME
+if [  -z "$JERMOLENE_HOME" ]; then
+    JERMOLENE_HOME=../../../jermolene.github.com
+fi
+
+if [  ! -d "$JERMOLENE_HOME" ]; then
+    echo 'A valid JERMOLENE_HOME directory must be set'
+    exit 1
+fi
+
+echo "Using JERMOLENE_HOME as [$JERMOLENE_HOME]"
+echo "five.tiddlywiki.com" > $JERMOLENE_HOME/CNAME
 
 node ../../tiddlywiki.js \
 	--verbose \
 	--password password \
 	--savetiddler ReadMe ../../readme.md text/html \
-	--savetiddler $:/core/templates/tiddlywiki5.template.html ../../../jermolene.github.com/index.html text/plain \
-	--savetiddler $:/core/templates/tiddlywiki5.encrypted.template.html ../../../jermolene.github.com/encrypted.html text/plain \
-	--savetiddler $:/core/templates/static.template.html ../../../jermolene.github.com/static.html text/plain \
+	--savetiddler $:/core/templates/tiddlywiki5.template.html $JERMOLENE_HOME/index.html text/plain \
+	--savetiddler $:/core/templates/tiddlywiki5.encrypted.template.html $JERMOLENE_HOME/encrypted.html text/plain \
+	--savetiddler $:/core/templates/static.template.html $JERMOLENE_HOME/static.html text/plain \
 	|| exit 1
 
 popd > /dev/null
@@ -26,8 +36,8 @@ pushd editions/empty > /dev/null
 node ../../tiddlywiki.js \
 	--verbose \
 	--password password \
-	--savetiddler $:/core/templates/tiddlywiki5.template.html ../../../jermolene.github.com/empty.html text/plain \
-	--savetiddler $:/core/templates/tiddlywiki5.encrypted.template.html ../../../jermolene.github.com/empty_encrypted.html text/plain \
+	--savetiddler $:/core/templates/tiddlywiki5.template.html $JERMOLENE_HOME/empty.html text/plain \
+	--savetiddler $:/core/templates/tiddlywiki5.encrypted.template.html $JERMOLENE_HOME/empty_encrypted.html text/plain \
 	|| exit 1
 
 popd > /dev/null