diff --git a/make/defs.mk b/make/defs.mk
index 991ba055..7417d083 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -687,11 +687,15 @@ ifeq ($(USE_MPATROL),true)
 endif
 
 ifeq ($(USE_VALGRIND),true)
-	#BUILD_CFLAGS+= -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
-	#BUILD_CPPFLAGS    += -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
+	BUILD_CFLAGS      += -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
+	BUILD_CPPFLAGS    += -include /usr/include/valgrind/memcheck.h -D_VALGRIND_
 	# BUILD_LDFLAGS   += 
 endif
 
+ifeq ($(USE_MCHECK),true)
+	BUILD_LDFLAGS     += -lmcheck
+endif
+
 ifeq ($(USE_STACK_PROTECTOR),true)
 	BUILD_CFLAGS+= -fstack-protector-all
 #	BUILD_CFLAGS+= -fstack-protector