Build Break with --enable-libcurl=yes option

There was a build break when I tried to build with --enable-libcurl=yes , I got following error.

In file included from http_transport_sender.c:35:
libcurl/axis2_libcurl.h:14: error: redefinition of typedef 'axis2_libcurl_t'
../../../../../include/axis2_http_sender.h:79: error: previous declaration of 'axis2_libcurl_t' was here
make[7]: *** [http_transport_sender.lo] Error 1