diff --git a/common.mk b/common.mk
index 34d4974f35..3398caaba0 100644
--- a/common.mk
+++ b/common.mk
@@ -966,6 +966,7 @@ EXT_SRCS = $(srcdir)/ext/ripper/ripper.c \
 	   $(srcdir)/ext/rbconfig/sizeof/sizes.c \
 	   $(srcdir)/ext/rbconfig/sizeof/limits.c \
 	   $(srcdir)/ext/socket/constdefs.c \
+	   $(srcdir)/ext/etc/constdefs.h \
 	   # EXT_SRCS
 
 srcs-ext: $(EXT_SRCS)
@@ -1108,6 +1109,12 @@ $(srcdir)/ext/socket/constdefs.c: $(srcdir)/ext/socket/depend
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../.. srcdir=. VPATH=../.. RUBY="$(BASERUBY)"
 
+$(srcdir)/ext/etc/constdefs.h: $(srcdir)/ext/etc/depend
+	$(Q) $(CHDIR) $(@D) && \
+	sed '/AUTOGENERATED/q' depend | \
+	$(exec) $(MAKE) -f - $(mflags) \
+		Q=$(Q) ECHO=$(ECHO) top_srcdir=../.. srcdir=. VPATH=../.. RUBY="$(BASERUBY)"
+
 ##
 
 run: fake miniruby$(EXEEXT) PHONY