Index: sources/test_regression/Makefile
===================================================================
--- sources/test_regression/Makefile	(revision 55)
+++ sources/test_regression/Makefile	(revision 56)
@@ -50,4 +50,13 @@
              17022006 \
 #
+
+
+ifndef SYSTEMC
+$(error Please set your SYSTEMC environment variable on the systemc directory root)
+endif
+ifndef SYSTEMCASS
+$(error Please set your SYSTEMCASS environment variable on the SystemCass directory root)
+endif
+
 
 DIR = \