Currently, if I don't have 'curl-devel' package installed, the build will fail at:

src/mongo/util/net/http_client_curl.cpp:35:10: fatal error: curl/curl.h: No such file or directory
 #include <curl/curl.h>
          ^~~~~~~~~~~~~

Unlike other required headers, it appears we don't have a configure check for this one. It would be preferable to have the build fail at config time.