diff --git a/cc/makevars.go b/cc/makevars.go
index 9ec917e..58c8de8 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -175,6 +175,7 @@
 		ctx.Strict(makePrefix+"NDK_GCC_VERSION", toolchain.GccVersion())
 	}
 
+	ctx.Strict(makePrefix+"TOOLCHAIN_ROOT", toolchain.GccRoot())
 	ctx.Strict(makePrefix+"TOOLS_PREFIX", gccCmd(toolchain, ""))
 	ctx.Strict(makePrefix+"SHLIB_SUFFIX", toolchain.ShlibSuffix())
 	ctx.Strict(makePrefix+"EXECUTABLE_SUFFIX", toolchain.ExecutableSuffix())