anchor.diff:      "--${boolEn (gmp != null)}-gmp"
       "--${boolEn (gnutls != null)}-gnutls"
       "--${boolEn (stdenv.cc.libc != null)}-iconv"
  +    (fflag "--${boolEn (jack2_lib != null)}-jack" "3.4")
       "--${boolEn (jni != null)}-jni"
       "--${boolEn (ladspa-sdk != null)}-ladspa"
       "--${boolEn (libass != null)}-libass"
  
positive.code:     "--${boolEn (kvazaar != null)}-libkvazaar"
      "--${boolEn (libmodplug != null)}-libmodplug"
      "--${boolEn (lame != null)}-libmp3lame"
      (deprfflag null "3.4" "--disable-libnut")
      #"--${boolEn (opencore-amr != null)}-libopencore-amrnb"
      /**/"--disable-libopencore-amrnb"
      #"--${boolEn (opencore-amr != null)}-libopencore-amrwb"
  
negative.code:     libbs2b
      libcaca
      libdc1394
      libdrm
      libgcrypt
      libmodplug
      libogg
      libraw1394
      librsvg
      libssh
      libtheora
      libva
  