anchor.diff:  
       # lttng tracing
       lttng-ust
  +
  +    # yamlparser
  +    libyaml
   
       gtest
     ];
  
positive.code: , openssl
  , libdrm
  , libevent
  , lttng-ust
  , gst_all_1
  , gtest
  
negative.code: 
  stdenv.mkDerivation {
    pname = "libcamera";
    version = "unstable-2022-07-15";
  
    src = fetchgit {
      url = "https://git.libcamera.org/libcamera/libcamera.git";
      rev = "e9b6b362820338d0546563444e7b1767f5c7044c";
      hash = "sha256-geqFcMBHcVe7dPdVOal8V2pVItYUdoC+5isISqRG4Wc=";
    };
  
    postPatch = ''
  