gnash won't build with ffmpeg option

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

I'm trying to build gnash with the ffmpeg option (pkgsrc-HEAD,
amd64-5.99.01) because gstreamer10 won't build (see another posting
about that...).  When I try, though, I get this:

        c++ -O2 -I/usr/pkgsrc/multimedia/gnash/work/.buildlink/include 
-I/usr/pkgsrc/multimedia/gnash/work/.buildlink/include/SDL -I/usr/include/krb5 
-I/usr/pkgsrc/multimedia/gnash/work/.buildlink/include/freetype2 -pthread 
-pthread -W -Wall -Wcast-align -Wcast-qual -Wpointer-arith -Wreturn-type 
-Wl,-R/usr/pkg/lib -Wl,--as-needed -o .libs/gprocessor gprocessor-processor.o 
-Wl,--export-dynamic  
-L/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libamf/.libs 
-L/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libnet/.libs 
-L/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libbase/.libs 
-L/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libmedia/.libs 
-L/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib 
../server/.libs/libgnashserver.so 
/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libnet/.libs/libgnashnet.so 
/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libmedia/.libs/libgnashmedia.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libfontconfig.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/l
 ibfreetype.so /usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libexpat.so 
../libamf/.libs/libgnashamf.so ../libnet/.libs/libgnashnet.so 
/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libamf/.libs/libgnashamf.so 
/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/libbase/.libs/libgnashbase.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libxml2.so 
../libbase/.libs/libgnashbase.so ../libmedia/.libs/libgnashmedia.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libjpeg.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libcurl.so -lgssapi -lheimntlm 
-lkrb5 -lhx509 -lcom_err -lasn1 -lroken -lcrypt 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libidn.so -lssl -lcrypto -lz 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libltdl.so -lboost_thread-mt-d 
-lboost_date_time-mt-d 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libSDL.so -lossaudio -laudio 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXt.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libSM.so /usr/pkgsrc
 /multimedia/gnash/work/.buildlink/lib/libICE.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXrandr.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXrender.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libaa.so -lusbhid -lpthread 
-lavcodec -ldts 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libvorbisenc.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libvorbis.so -lavformat 
-lavutil /usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libtheora.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libogg.so -lswscale 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libglib-2.0.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libpcre.so -lintl -lc 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXi.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXext.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libX11.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXdmcp.so 
/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib/libXau.so -lm  -Wl,--rp
 ath -Wl,/usr/pkg/lib/gnash -Wl,--rpath 
-Wl,/usr/pkgsrc/multimedia/gnash/work/.buildlink/lib
        ld: cannot find -ldts
        gmake[2]: *** [gprocessor] Error 1
        gmake[2]: Leaving directory 
`/usr/pkgsrc/multimedia/gnash/work/gnash-0.8.3/utilities'

The gnash README file notes that if ffmpeg version 51.40.4 is used, gnash
won't link.  However, ffmpeg doesn't have formal tarball releases; they
just tell you to visit their SVN tree.  The distfile we use is date-stamped,
and I can't find any indication in the extracted files (or for that matter
on the ffmpeg web site) what version 51.40.4 might correspond to...

Suggestions welcome...


                --Steve Bellovin, http://www.cs.columbia.edu/~smb