Hax to make it boot
diff --git a/gui/Android.mk b/gui/Android.mk
index dd24d8f..f73a2e5 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -20,6 +20,7 @@
     listbox.cpp \
     keyboard.cpp \
     input.cpp \
+    gui-functions.c
 
 ifneq ($(TWRP_CUSTOM_KEYBOARD),)
   LOCAL_SRC_FILES += $(TWRP_CUSTOM_KEYBOARD)
@@ -67,4 +68,4 @@
 
 LOCAL_GENERATED_SOURCES := $(TWRP_RES_GEN)
 LOCAL_SRC_FILES := twrp $(TWRP_RES_GEN)
-include $(BUILD_PREBUILT)
\ No newline at end of file
+include $(BUILD_PREBUILT)