diff --git a/bacnet-stack/.indent.pro b/bacnet-stack/.indent.pro
index 730092bc..9baced44 100644
--- a/bacnet-stack/.indent.pro
+++ b/bacnet-stack/.indent.pro
@@ -1 +1 @@
--kr -nut -nlp
+-kr -nut -nlp -ip4 -cli4
diff --git a/bacnet-stack/indent.sh b/bacnet-stack/indent.sh
index ec58d1ea..d1ec15ec 100755
--- a/bacnet-stack/indent.sh
+++ b/bacnet-stack/indent.sh
@@ -1,22 +1,30 @@
 #!/bin/sh
 # indent uses a local indent.pro file if it exists
-# echo "-kr -nut -nlp" > .indent.pro
+
+# exit silently if utility is not installed
+[ -x /usr/bin/indent ] || exit 0
+[ -x /usr/bin/dos2unix ] || exit 0
+
+if [ ! -x .indent.pro ] 
+then
+  echo "-kr -nut -nlp -ip4 -cli4" > .indent.pro
+fi
 
 directory=${1-`pwd`}
 for filename in $( find $directory -name '*.c' )
 do
   echo Fixing DOS/Unix $filename
-  dos2unix $filename
+  /usr/bin/dos2unix $filename
   echo Indenting $filename
-  indent -kr -nut -nlp $filename
+  /usr/bin/indent $filename
 done
 
 for filename in $( find $directory -name '*.h' )
 do
   echo Fixing DOS/Unix $filename
-  dos2unix $filename
+  /usr/bin/dos2unix $filename
   echo Indenting $filename
-  indent -kr -nut -nlp $filename
+  /usr/bin/indent $filename
 done
 
 for filename in $( find $directory -name '*~' )