Use actual port name as PORTNAME, and set ELIXIR_APP_NAME.

misc/elixir-uuid/Makefile

@@ -1,10 +1,9 @@
 # $FreeBSD$
 
-PORTNAME=	uuid
+PORTNAME=	elixir-uuid
 PORTVERSION=	1.0.1
 DISTVERSIONPREFIX=	v
 CATEGORIES=	misc
-PKGNAMEPREFIX=	elixir-
 
 MAINTAINER=	olgeni@FreeBSD.org
 COMMENT=	UUID generator and utilities for Elixir
@@ -14,6 +13,7 @@ LICENSE=	APACHE20
 USES=		elixir
 USE_GITHUB=	yes
 GH_ACCOUNT=	zyro
-GH_PROJECT=	${PKGNAMEPREFIX}${PORTNAME}
+
+ELIXIR_APP_NAME=uuid
 
 .include <bsd.port.mk>