From 83aa1363ea0d39fda5c2625c1147a0751e24a2f4 Mon Sep 17 00:00:00 2001
From: Cary R <cygcary@yahoo.com>
Date: Wed, 28 Oct 2009 18:26:08 -0700
Subject: [PATCH] Add a warning message if an environment variable is not
 found.

Instead of silently skipping the substitution we now print a warning
message if an environment variable substitution is not found.
---
 driver/substit.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/driver/substit.c b/driver/substit.c
index 1c2f1862e..833f45b80 100644
--- a/driver/substit.c
+++ b/driver/substit.c
@@ -19,6 +19,7 @@
 
 # include  <string.h>
 # include  <stdlib.h>
+# include  <stdio.h>
 #ifdef HAVE_MALLOC_H
 # include  <malloc.h>
 #endif
@@ -48,9 +49,13 @@ char* substitutions(const char*str)
 		  str = ep + 1;
 
 		  value = getenv(name);
-		  free(name);
 		  if (value == 0)
+			fprintf(stderr, "Warning: environment variable "
+			        "\"%s\" not found during command file "
+			        "processing.\n", name);
+			free(name);
 			continue;
+		  free(name);
 
 		  if (strlen(value) >= (nbuf - (cp-buf))) {
 			size_t old_size = cp - buf;