Index: tools/build/test-includes/Makefile
===================================================================
--- tools/build/test-includes/Makefile
+++ tools/build/test-includes/Makefile
@@ -18,6 +18,7 @@
 INTERNALPROG=	This is a compile-only test
 MAN=
 HDRS!=	(cd ${SRCTOP}/sys; ls sys/[^_]*.h net*/[^_]*.h)
+LDFLAGS=-nostdlib -e _start
 
 # Some files have to be clean for extra defines too...
 CFLAGS.event.c=	-D_WANT_KEVENT32 -D_WANT_FREEBSD11_KEVENT
Index: tools/build/test-includes/test-includes.c
===================================================================
--- tools/build/test-includes/test-includes.c
+++ tools/build/test-includes/test-includes.c
@@ -1,7 +1,10 @@
 /* Public domain */
 
-int
-main(void)
-{
-	return 0;
-}
+/*
+ * We use _start because it's the default starting symbol, but just to make sure
+ * we specify -e _start on the command line. Coupled with -stdlib, this means
+ * that we don't have to have the libraries and crt*.o files build when we test
+ * the header.
+ */
+int _start(void);
+int _start(void) { return 0; }