What about this?
--- Makefile Tue Jul 25 13:30:27 2017
+++ Makefile Tue Jul 25 13:36:34 2017
@@ -2,9 +2,14 @@
COMMENT = spaced learning system
-DISTNAME = anki-2.0.45
-EXTRACT_SUFX = -source.tgz
+V = 2.0.45
+DISTNAME = anki-${V}
+
+PKGNAME = anki-${V}
+
+DISTFILES = anki-${V}-source${EXTRACT_SUFX}
+
CATEGORIES = education
HOMEPAGE = http://ankisrs.net/
@@ -15,6 +20,8 @@
PERMIT_PACKAGE_CDROM = Yes
MASTER_SITES = https://apps.ankiweb.net/downloads/current/
+
+EXTRACT_SUFX = .tgz
MODULES = lang/python
