#include <curl/curl.h>
#define PHP_HTTP_CURL_VERSION(x, y, z) (LIBCURL_VERSION_NUM >= (((x)<<16) + ((y)<<8) + (z)))
+#define PHP_HTTP_CURL_FEATURE(f) (curl_version_info(CURLVERSION_NOW)->features & (f))
+
+#if !PHP_HTTP_CURL_VERSION(7,21,5)
+# define CURLE_UNKNOWN_OPTION CURLE_FAILED_INIT
+#endif
PHP_MINIT_FUNCTION(http_curl);
PHP_MSHUTDOWN_FUNCTION(http_curl);