diff --git a/Makefile.libretro b/Makefile.libretro
index 8ce3a7c..d6a9e2b 100644
--- a/Makefile.libretro
+++ b/Makefile.libretro
@@ -3,6 +3,7 @@ LOGSOUND = 0
 FRONTEND_SUPPORTS_RGB565 = 1
 HAVE_CHD = 1
 HAVE_SYS_PARAM = 1
+HOOK_CPU = 0
 
 CORE_DIR := .
 
diff --git a/libretro/Makefile.common b/libretro/Makefile.common
index 232e04c..154c9c8 100644
--- a/libretro/Makefile.common
+++ b/libretro/Makefile.common
@@ -16,6 +16,11 @@ ifneq (,$(findstring msvc2003,$(platform)))
 INCFLAGS += -I$(LIBRETRO_COMM_DIR)/include/compat/msvc
 endif
 
+ifeq ($(HOOK_CPU), 1)
+   GENPLUS_SRC_DIR += $(CORE_DIR)/core/debug
+   FLAGS += -DHOOK_CPU
+endif
+
 ifeq ($(HAVE_CHD), 1)
    INCFLAGS += -I$(CHDLIBDIR)/src \
 					-I$(CHDLIBDIR)/deps/libFLAC/include \