HuangDayu opened a new issue #2419:
URL: https://github.com/apache/apisix/issues/2419
### Issue description
```log
huangdayu@SK-20191227AUWA:~/apache-apisix-1.5$ make deps
luarocks install rockspec/apisix-master-0.rockspec --tree=deps --only-deps
--local
Stopping after installing dependencies for apisix master-0
huangdayu@SK-20191227AUWA:~/apache-apisix-1.5$ ./bin/apisix version
please remove the cjson library in Lua, it may conflict with the cjson
library in openresty.
luarocks remove cjson
huangdayu@SK-20191227AUWA:~/apache-apisix-1.5$ sudo luarocks remove cjson
Error: Could not find rock 'cjson' in /usr/local
huangdayu@SK-20191227AUWA:~/apache-apisix-1.5$
```
### Environment
* apisix version (cmd: `apisix version`): 1.5
* OS:
```shell
LSB Version: core-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
```
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