diff --git a/config/vars.mk b/config/vars.mk
index 1984ced..0da7e90 100644
--- a/config/vars.mk
+++ b/config/vars.mk
@@ -28,8 +28,7 @@ OS := $(shell uname)
 CUR_DIR := $(shell pwd)
 
 # NDK config
-$(shell export err() { echo "$1" && exit 1; })
-$(shell [ -d ../android-ndk ] || err "error: ndk not found")
+$(shell [ -d ../android-ndk ] || echo "error: ndk not found" && exit 1)
 NDK_DIR := $(shell cd ../android-ndk && pwd && cd -)
 
 ifeq ($(OS),Linux)