connect: implement TCP Fast Open for Linux

Closes #660

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/url.c b/lib/url.c
index e76d4e8e0..f1028f34c 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2633,7 +2633,7 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
     data->set.tcp_keepintvl = va_arg(param, long);
     break;
   case CURLOPT_TCP_FASTOPEN:
-#if defined(CONNECT_DATA_IDEMPOTENT)
+#if defined(CONNECT_DATA_IDEMPOTENT) || defined(MSG_FASTOPEN)
     data->set.tcp_fastopen = (0 != va_arg(param, long))?TRUE:FALSE;
 #else
     result = CURLE_NOT_BUILT_IN;