anchor.diff:  
     buildPhase = ''
       for i in ${toString subdirs}; do
  -      make -C $i
  +      make -C $i BEEGFS_OPENTK_IBVERBS=1
       done
  -    make -C beegfs_admon/build admon_gui
  +    make -C beegfs_admon/build admon_gui BEEGFS_OPENTK_IBVERBS=1
     '';
   
     installPhase = ''
  
positive.code:   };
  
    nativeBuildInputs = [ which unzip pkgconfig cppunit openjdk ant];
    buildInputs = [ libuuid attr xfsprogs zlib openssl sqlite jre ];
  
    postPatch = ''
      patchShebangs ./
  
negative.code: { stdenv, fetchurl, pkgconfig, unzip, which
  , libuuid, attr, xfsprogs, cppunit, rdma-core
  , zlib, openssl, sqlite, jre, openjdk, ant
  } :
  
  