I have installed libcurl 7.33.0 on Linux. I used the following commands to install:
./configure
make
make install
If I run curl h
Ubuntu does include curl by default as far as I know. So if you don't need specifically the 7.33.0 version, then purge it and install it again from the repository.
#remove everything you had with curl
sudo apt-get purge curl
#optional update
sudo apt-get update && sudo apt-get upgrade
#install it from repository
sudo apt-get install curl