Failure log from ffbuild/config.log:
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I/usr/local/apps/ffmpeg/ffmpeg_build/include -std=c11 -fomit-frame-pointer -fPIC -pthread -pthread -I/usr/include/librsvg-2.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -pthread -pthread -pthread -c -o /tmp/ffconf.1RB5EHXj/test.o /tmp/ffconf.1RB5EHXj/test.c
gcc -L/usr/local/apps/ffmpeg/ffmpeg_build/lib -Wl,--as-needed -Wl,-z,noexecstack -pthread -I/usr/include/librsvg-2.0 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -pthread -pthread -pthread -o /tmp/ffconf.1RB5EHXj/test /tmp/ffconf.1RB5EHXj/test.o -lrsvg-2 -lm -lgio-2.0 -lz -lresolv -lselinux -lgdk_pixbuf-2.0 -lm -lgmodule-2.0 -ldl -lpng16 -lm -lz -lm -lcairo -lz -lgobject-2.0 -lffi -lglib-2.0 -lpcre -lpixman-1 -lfontconfig -lexpat -lfreetype -lexpat -lfreetype -lz -lpng16 -lm -lz -lm -lpng16 -lm -lz -lm -lxcb-shm -lxcb-render -lXrender -lXext -lX11 -lpthread -lxcb -lXau -lXdmcp -lpthread -lm
/usr/bin/ld: cannot find -lselinux
collect2: error: ld returned 1 exit status
ERROR: librsvg-2.0 not found using pkg-config


Config:
apt-get update -qq && apt-get -y install \
  autoconf \
  automake \
  build-essential \
  cmake \
  git \
  libass-dev \
  libfreetype6-dev \
  librsvg2-dev \
  libtheora-dev \
  libtool \
  libvorbis-dev \
  libx264-dev \
  mercurial \
  pkg-config \
  texinfo \
  curl \
  zlib1g-dev \
  nasm \
  yasm

export cwd=/usr/local/apps/ffmpeg

mkdir -p ${cwd} && \
  mkdir -p ${cwd}/ffmpeg_sources \
  mkdir -p ${cwd}/ffmpeg_build \
  mkdir -p ${cwd}/ffmpeg_bin

cd ${cwd}/ffmpeg_sources && \
curl -O http://ffmpeg.org/releases/ffmpeg-${FFMPEG_VERSION}.tar.gz && \
tar xvf ffmpeg-${FFMPEG_VERSION}.tar.gz && \
cd ffmpeg-${FFMPEG_VERSION} && \
PATH="${cwd}/ffmpeg_bin:$PATH" PKG_CONFIG_PATH="${cwd}/ffmpeg_build/lib/pkgconfig" ./configure \
  --prefix="${cwd}/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I${cwd}/ffmpeg_build/include" \
  --extra-ldflags="-L${cwd}/ffmpeg_build/lib" \
  --extra-libs="-lpthread -lm" \
  --bindir="${cwd}/ffmpeg_bin" \
  --enable-librsvg

PATH="${cwd}/ffmpeg_bin:$PATH" make && \
make install && \
hash -r && \
mv ${cwd}/ffmpeg_bin/* /usr/local/bin