gimp-gap: Use automake 1.17 if available

See: https://trac.macports.org/ticket/70408

graphics/gimp-gap/Portfile

@@ -24,7 +24,6 @@ universal_variant  no
 use_parallel_build no
 
 homepage        http://www.gimp.org/
-platforms       darwin
 master_sites    gimp:gimp/plug-ins/v${branch}/gap/:gap \
                 http://www.ffmpeg.org/releases/:ffmpeg
 
@@ -57,12 +56,12 @@ post-patch     {
                    reinplace "s|MP_FFMPEG_EXTRAS|${ffmpeg_extras}|" ${worksrcpath}/extern_libs/configure_options_ffmpeg.txt
                }
 
-depends_build   port:pkgconfig \
-                port:intltool \
-                port:gmake \
-                port:autoconf \
+depends_build   port:autoconf \
                 port:automake \
+                port:gmake \
+                port:intltool \
                 port:libtool \
+                path:bin/pkg-config:pkgconfig \
                 port:yasm
 
 depends_lib     path:lib/pkgconfig/gimp-2.0.pc:gimp2 \

graphics/gimp-gap/files/autogen.sh

@@ -88,7 +88,10 @@ fi
 
 
 echo -n "checking for automake >= $AUTOMAKE_REQUIRED_VERSION ... "
-if (automake-1.16 --version) < /dev/null > /dev/null 2>&1; then
+if (automake-1.17 --version) < /dev/null > /dev/null 2>&1; then
+   AUTOMAKE=automake-1.17
+   ACLOCAL=aclocal-1.17
+elif (automake-1.16 --version) < /dev/null > /dev/null 2>&1; then
    AUTOMAKE=automake-1.16
    ACLOCAL=aclocal-1.16
 elif (automake-1.15 --version) < /dev/null > /dev/null 2>&1; then