--- a/src/runtime/Config.x86-bsd
+++ b/src/runtime/Config.x86-bsd
@@ -17,3 +17,7 @@
 OS_LIBS = # -ldl
 
 GC_SRC = gencgc.c
+
+# Nothing to do for after-grovel-headers.
+.PHONY: after-grovel-headers
+after-grovel-headers: