Fix DFTTest

Dockerfile

@@ -69,6 +69,29 @@ RUN cd /tmp \
     && cd .. \
     && rm -rf vapoursynth-descale
 
+# TODO: Remove when working version is in deb-multimedia (current one crashes
+# with symbol lookup error:
+# /usr/lib/x86_64-linux-gnu/vapoursynth/libdfttest.so: undefined symbol:
+# fftwf_make_planner_thread_safe
+COPY dfttest-dummy /tmp/
+
+RUN cd /tmp/ \
+    && apt-get -y install equivs \
+    && equivs-build dfttest-dummy \
+    && dpkg -i vapoursynth-dfttest_7-dmo2_all.deb \
+    && apt-get purge -y equivs \
+    && apt-get autoremove --purge -y \
+    && rm dfttest-dummy vapoursynth-dfttest_7-dmo2_all.deb
+
+RUN cd /tmp \
+    && git clone --depth=1 https://github.com/HomeOfVapourSynthEvolution/VapourSynth-DFTTest \
+    && cd VapourSynth-DFTTest \
+    && meson build --prefix /usr/local \
+    && ninja -C build \
+    && ninja -C build install \
+    && cd .. \
+    && rm -rf VapourSynth-DFTTest
+
 # TODO: Remove once debian has compatible libplacebo version
 RUN echo "deb-src" http://deb.debian.org/debian testing main >> /etc/apt/sources.list.d/src.list \
     && apt-get update \

dfttest-dummy

@@ -0,0 +1,5 @@
+Section: video
+Priority: optional
+Package: vapoursynth-dfttest
+Version: 1000
+Description: Dummy