Fix util.h build from hashfast include.
diff --git a/util.h b/util.h
index 96157fa..04343b7 100644
--- a/util.h
+++ b/util.h
@@ -53,6 +53,7 @@
#endif
#ifdef HAVE_LIBCURL
+#include <curl/curl.h>
typedef curl_proxytype proxytypes_t;
#else
typedef int proxytypes_t;