Set MAKE_VERSION=3.81 for Android build
diff --git a/parser.go b/parser.go
index f2b4a3f..2932ae2 100644
--- a/parser.go
+++ b/parser.go
@@ -431,6 +431,8 @@
 CC:=cc
 CXX:=g++
 MAKE:=kati
+# Pretend to be GNU make 3.81, for compatibility.
+MAKE_VERSION:=3.81
 # TODO: Add more builtin vars.
 
 # http://www.gnu.org/software/make/manual/make.html#Catalogue-of-Rules