diff --git a/libaux/Makefile b/libaux/Makefile
index d27451b..fda6efe 100644
--- a/libaux/Makefile
+++ b/libaux/Makefile
@@ -1,6 +1,9 @@
 include ../make/ufuncs.mk
 
+$(eval $(call add_include,libsystem))
+
 libname := libaux
+
 cflags += -DPRINTF_INCLUDE_CONFIG_H=1
 
 include ../make/lib.mk