Command line curl is separate to libcurl that you can use in programs.

Install curl

Installing the OpenSSL version

sudo apt-get install libcurl4-openssl-dev

Using the Library In A NetBeans Project

Including the library header file

#include <curl/curl.h>

When you compile you also need to include -lcurl so the libraries object file is added to the final compilation.

Right click the project > Properties > Build > Linker > In the ‘Libraries’ section press the ‘…’ button > Add Option… > Other Option > Enter: -lcurl

Current version

Seems hard to identify for the install command!

Current version: https://curl.haxx.se/changes.html

However install libcurl7-openssl-dev does not work even though its at version 7 currently. Using command : sudo apt-get install libcurl-dev
Gave a response of:

• Package libcurl-dev is a virtual package provided by:
• libcurl4-openssl-dev 7.38.0-4+deb8u16
• libcurl4-nss-dev 7.38.0-4+deb8u16
• libcurl4-gnutls-dev 7.38.0-4+deb8u16
• You should explicitly select one to install.

So libcurl4 it seems to be.

Removing curl

sudo apt remove curl