Install dummy libc-internal.h

Makefile.in

@@ -114,6 +114,8 @@ install_headers:
 	fi ; \
 	tar -chf - --exclude .svn $$extra_exclude include \
 		| tar -xf - -C $(PREFIX)$(DEVEL_PREFIX)
+	echo -e '#ifndef _LIBC_INTERNAL_H\n#define _LIBC_INTERNAL_H 1\n#endif\n' > \
+		$(PREFIX)$(DEVEL_PREFIX)include/libc-internal.h
 	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/dl-osinfo.h
 	$(RM) $(PREFIX)$(DEVEL_PREFIX)include/bits/uClibc_uintmaxtostr.h
 ifneq ($(UCLIBC_HAS_FLOATS),y)