--- a/src/runtime/Config.hppa-linux
+++ b/src/runtime/Config.hppa-linux
@@ -19,3 +19,7 @@
 OS_LIBS = -ldl
 
 GC_SRC = cheneygc.c
+
+# Nothing to do for after-grovel-headers.
+.PHONY: after-grovel-headers
+after-grovel-headers: