diff --git a/Makefile b/Makefile
index 7f37aed9..94bea145 100644
--- a/Makefile
+++ b/Makefile
@@ -83,7 +83,9 @@ all: +all README.md
 binaries: all
 tests: all
 	
-README.md: $(OBJ)/scripts/+mkdocindex/mkdocindex$(EXT)
+# No $(EXT) here, even on Windows, as this program isn't exported
+# outside WSL.
+README.md: $(OBJ)/scripts/+mkdocindex/mkdocindex
 	@echo $(PROGRESSINFO)MKDOC $@
 	@csplit -s -f$(OBJ)/README. README.md '/<!-- FORMATSSTART -->/' '%<!-- FORMATSEND -->%'
 	@(cat $(OBJ)/README.00 && $< && cat $(OBJ)/README.01) > README.md
diff --git a/build/ab.py b/build/ab.py
index d7175d6d..f4e424d6 100644
--- a/build/ab.py
+++ b/build/ab.py
@@ -500,7 +500,6 @@ def emit_rule(self, ins, outs, cmds=[], label=None):
         globalId = globalId + 1
 
         emit(f"OUTS_{outsn}", "=", *fouts, into=lines)
-        emit(f"$(warning $(OUTS_{outsn}))", into=lines)
         emit(f"INS_{insn}", "=", *fins, into=lines)
         emit(name, ":", f"$(OUTS_{outsn})", into=lines)
         emit(hashfile, ":", into=lines)