Add a comment about why RM and RM_OPTS are not in config.mk

diff --git a/mk/tree.mk b/mk/tree.mk
index b7d2875..d27e2a7 100644 (file)
--- a/mk/tree.mk
+++ b/mk/tree.mk
@@ -46,6 +46,9 @@ INPLACE_BIN           = $(INPLACE)/bin
 INPLACE_LIB            = $(INPLACE)/lib
 INPLACE_MINGW          = $(INPLACE)/mingw
 
+# These are here, rather than in config.mk, as they need to exist in an
+# unconfigured tree so that the various clean targets can be used
+# without configuring:
 RM = rm
 RM_OPTS = -f