I updated to curl 7.15.0, and tried to build:
$ ./configure --with-curl-config=/usr/local/bin/curl-config .......
....
configure: checking for curl-config...
found libcurl version 7.15.0
configure: error: libcurl version 7.10.1 or more recent is required.
Entered in bugzilla as bug 1504.
..Tom