libdlna: use ffmpeg pg

devel/libdlna/Portfile

@@ -1,6 +1,7 @@
 # -*- Mode: Tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:et:sw=4:ts=4:sts=4
 
 PortSystem          1.0
+PortGroup           ffmpeg 1.0
 
 name                libdlna
 version             0.2.4
@@ -14,9 +15,8 @@ long_description    libdlna aims at being the reference open-source implementati
                     provide DLNA support to uShare, an embedded DLNA & UPnP A/V Media Server, \
                     but it will be used to build both DLNA servers and players in the long term.
 
-set ffmpeg_ver      4
+ffmpeg.version      4
 
-depends_lib         port:ffmpeg${ffmpeg_ver}
 homepage            http://libdlna.geexbox.org/
 master_sites        ${homepage}releases
 use_bzip2           yes
@@ -33,8 +33,7 @@ platform darwin {
 }
 
 # cppflags are ignored
-configure.cflags-prepend    -I${prefix}/libexec/ffmpeg${ffmpeg_ver}/include
-configure.ldflags-prepend   -L${prefix}/libexec/ffmpeg${ffmpeg_ver}/lib
+configure.cflags-append {*}${configure.cppflags}
 
 build.env           CFLAGS=${configure.cflags}