winner didn't accept my steam invit

It's been 30 minutes. He has 7 days to respond to your contact attempts (Steam and email).

Okay thanks for your answers. Will see it in one week then.

edit : i sent to him via email

Ce n'est pas CPC Gifts, ici :-P

Attends un peu qu'il se connecte et qu'il accepte ton invitation, et assure-toi de faire un screen de tes tentatives de prendre contact, ça te servira pour demander le reroll si tu n'as pas de signe de vie après une semaine (mais en général tu n'as pas besoin de courir après les gagnants très longtemps)

(Ah ah coucou David ! o/
Celui-ci était online quand je lui ai envoyé une invit. Il a dû le prendre comme un tentative de scam et bloquer sans réfléchir. Du coup je lui ai envoyé son gift par email, il le prendra s'il le veut.)

It's his loss. I've heard of cases where somebody marked it as not received even though they denied the steam friend's list request.

send it trought email

To be honest, I'd ignore most people sending me friend requests as well, I guess he doesn't realise s/he's won? Just shoot them an email explaining what's up and tell them to accept your friend request. I've had that happen to me as well.

If they haven't responded to Steam or e-mail after a week, send in a re-roll request and include a link to a screenshot of the e-mail to speed things up, please.

I find that an exploratory email usually get's their attention. Something with "SteamGifts" in the header, so it doesn't get trashed without being read.

edit : Just seen he already has the game on his account. Have requested a reroll.