Pecl_http installl

I am trying to install pecl_http on my account which has a php install using the script from the wiki, and have modified the other pecl install scripts to install pecl_http.

The problem is that I run into some errors during config:
checking for curl/curl.h… not found
configure: error: could not find curl/curl.h

How do I have the install point to the proper files?

Thanks - I’m very new to all this.