I am trying to compile `ChatScript` but I get this error message:
json.cpp:474:23: fatal error: curl/curl.h: No such file or directory
When I try `apt-get install curl` it says:
curl is already the newest version (7.47.0-1ubuntu2.7).
I also tried to install `curl-devel` and `libcurl` but I get:
E: Unable to locate package ...
Why this error happens and how can I fix it? I am using `Ubuntu-server 16.04 sunxi-arm7`.