drogon
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build.sh should sudo install
https://github.com/drogonframework/drogon/blob/5c43b82dc27eb0e0ecedb524fa16bf942ddbe60a/build.sh#L51
With limited experience with drogon, it seems that all of build.sh can run as a user, except the install step which should be run as sudo (at least on linux machines)
This is Linux specific. Run the build.sh as super user (sudo) to begin with. It should solve your problem. You should do this since install writes to admin privileged locations on your machine.
try
sudo bash ./build.sh