How to fix ESP-IDF Install Manager (EIM) Prerequisites Missing: common.prerequisites.manualHint flex, bison, gperf, ccache

Problem

While trying to install a toolchain using the ESP-IDF Install Manager (EIM), you might encounter an error message indicating that certain prerequisites are missing. The error message may look something like this:

common.prerequisites.manualHint
flex, bison, gperf, ccache

Solution

You need to install the missing prerequisites: flex, bison, gperf, and ccache on your system. On Ubuntu and Debian, you can do this using the following command in your terminal:

sudo apt -y install flex bison gperf ccache

After that, you can try running the installation again, and it should proceed without the previous error.