Fix the Readme about Kconfig-frontend Installation explanation
@@ -78,7 +78,7 @@ Please keep in mind that we are actively working on board configurations, and wi
## APPENDIX
### Kconfig-frontends Installation
-1. The *gperf* and *libncurses5-dev* packages should be installed.
+1. The *byacc*, *flex*, *gperf* and *libncurses5-dev* packages should be installed.
```bash
sudo apt-get install byacc flex gperf libncurses5-dev
```
