diff --git a/GNUmakefile b/GNUmakefile
index 7245aa03583..e8ec31fcbdd 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -5,6 +5,9 @@ OPENBC_HOME ?= ../openbc_poisson
 DEBUG = FALSE
 #DEBUG	= TRUE
 
+WARN_ALL = TRUE
+#WARN_ERROR=TRUE
+
 #DIM     = 2
 DIM = 3