anchor.diff:  , writeText
   }:
   
  +let
  +  hip = stdenv.mkDerivation rec {
  +    pname = "hip";
  +    version = "4.5.2";
  +
  +    src = fetchFromGitHub {
  +      owner = "ROCm-Developer-Tools";
  +      repo = "HIP";
  +      rev = "rocm-${version}";
  +      sha256 = "sha256-AuA5ubRPywXaBBrjdHg5AT8rrVKULKog6Lh8jPaUcXY=";
  +    };
  +
  +    # - fix bash paths
  +    # - fix path to rocm_agent_enumerator
  +    # - fix hcc path
  +    # - fix hcc version parsing
  +    # - add linker flags for libhsa-runtime64 and hc_am since libhip_hcc
  +    #   refers to them.
  +    prePatch = ''
  +      for f in $(find bin -type f); do
  +        sed -e 's,#!/usr/bin/perl,#!${perl}/bin/perl,' \
  +            -e 's,#!/bin/bash,#!${stdenv.shell},' \
  +            -i "$f"
  +      done
  +
  +      substituteInPlace bin/hip_embed_pch.sh \
  +        --replace '$LLVM_DIR/bin/' ""
  +
  +      sed 's,#!/usr/bin/python,#!${python}/bin/python,' -i hip_prof_gen.py
  +
  +      sed -e 's,$ROCM_AGENT_ENUM = "''${ROCM_PATH}/bin/rocm_agent_enumerator";,$ROCM_AGENT_ENUM = "${rocminfo}/bin/rocm_agent_enumerator";,' \
  +          -e 's,^\($DEVICE_LIB_PATH=\).*$,\1"${rocm-device-libs}/amdgcn/bitcode";,' \
  +          -e 's,^\($HIP_COMPILER=\).*$,\1"clang";,' \
  +          -e 's,^\($HIP_RUNTIME=\).*$,\1"ROCclr";,' \
  +          -e 's,^\([[:space:]]*$HSA_PATH=\).*$,\1"${rocm-runtime}";,'g \
  +          -e 's,^\([[:space:]]*\)$HIP_CLANG_INCLUDE_PATH = abs_path("$HIP_CLANG_PATH/../lib/clang/$HIP_CLANG_VERSION/include");,\1$HIP_CLANG_INCLUDE_PATH = "${clang-unwrapped}/lib/clang/$HIP_CLANG_VERSION/include";,' \
  +          -e 's,^\([[:space:]]*$HIPCXXFLAGS .= " -isystem \\"$HIP_CLANG_INCLUDE_PATH/..\\"\)";,\1 -isystem ${rocm-runtime}/include";,' \
  +          -e 's,`file,`${file}/bin/file,g' \
  +          -e 's,`readelf,`${binutils-unwrapped}/bin/readelf,' \
  +          -e 's, ar , ${binutils-unwrapped}/bin/ar ,g' \
  +          -i bin/hipcc
  +
  +      sed -e 's,^\($HSA_PATH=\).*$,\1"${rocm-runtime}";,' \
  +          -e 's,^\($HIP_CLANG_PATH=\).*$,\1"${clang}/bin";,' \
  +          -e 's,^\($HIP_PLATFORM=\).*$,\1"amd";,' \
  +          -e 's,$HIP_CLANG_PATH/llc,${llvm}/bin/llc,' \
  +          -e 's, abs_path, Cwd::abs_path,' \
  +          -i bin/hipconfig
  +
  +      sed -e 's, abs_path, Cwd::abs_path,' -i bin/hipvars.pm
  +    '';
  +
  +    buildPhase = "";
  +
  +    installPhase = ''
  +      runHook preInstall
  +
  +      mkdir -p $out
  +      cp -r * $out/
  +
  +      runHook postInstall
  +    '';
  +
  +    meta = with lib; {
  +      description = "C++ Heterogeneous-Compute Interface for Portability";
  +      homepage = "https://github.com/ROCm-Developer-Tools/HIP";
  +      license = licenses.mit;
  +      maintainers = with maintainers; [ lovesegfault ];
  +      platforms = platforms.linux;
  +    };
  +  };
  +in
   stdenv.mkDerivation rec {
  -  name = "hip";
  -  version = "4.3.1";
  +  pname = "hip";
  +  version = "4.5.2";
  +
     src = fetchFromGitHub {
       owner = "ROCm-Developer-Tools";
  -    repo = "HIP";
  +    repo = "hipamd";
       rev = "rocm-${version}";
  -    sha256 = "sha256-dUdP32H0u6kVItS+VUE549vvxkV1mSN84HvyfeK2hEE=";
  +    sha256 = "WvOuQu/EN81Kwcoc3ZtGlhb996edQJ3OWFsmPuqeNXE=";
     };
   
  -  # FIXME: https://github.com/ROCm-Developer-Tools/HIP/issues/2317
  -  postPatch = ''
  -    cp ${rocm-opencl-runtime.src}/amdocl/cl_vk_amd.hpp amdocl/
  -  '';
  -
  -  nativeBuildInputs = [ cmake python makeWrapper ];
  +  nativeBuildInputs = [ cmake python makeWrapper perl ];
  +  buildInputs = [ libxml2 numactl libglvnd libX11 ];
     propagatedBuildInputs = [
       clang
       compiler-rt
       lld
       llvm
  -    rocclr
       rocm-comgr
       rocm-device-libs
       rocm-runtime
  
positive.code:     export DEVICE_LIB_PATH=${rocm-device-libs}/lib
    '';
  
    # The patch version is the last two digits of year + week number +
    # day in the week: date -d "2021-07-25" +%y%U%w
    workweek = "21300";
  
    cmakeFlags = [
      "-DHSA_PATH=${rocm-runtime}"
      "-DHIP_COMPILER=clang"
      "-DHIP_PLATFORM=amd"
      "-DHIP_VERSION_GITDATE=${workweek}"
      "-DCMAKE_C_COMPILER=${clang}/bin/clang"
      "-DCMAKE_CXX_COMPILER=${clang}/bin/clang++"
      "-DLLVM_ENABLE_RTTI=ON"
      "-DLIBROCclr_STATIC_DIR=${rocclr}/lib/cmake"
      "-DROCclr_DIR=${rocclr}"
      "-DHIP_CLANG_ROOT=${clang-unwrapped}"
    ];
  
    patches = [
      (fetchpatch {
        name = "no-git-during-build";
        url = "https://github.com/acowley/HIP/commit/310b7e972cfb23216250c0240ba6134741679aee.patch";
        sha256 = "08ky7v1yvajabn9m5x3afzrnz38gnrgc7vgqlbyr7s801c383ha1";
      })
      (fetchpatch {
        name = "use-PATH-when-compiling-pch";
        url = "https://github.com/acowley/HIP/commit/bfb4dd1eafa9714a2c05a98229cc35ffa3429b37.patch";
        sha256 = "1wp0m32df7pf4rhx3k5n750fd7kz10zr60z0wllb0mw6h00w6xpz";
      })
    ];
  
    # - fix bash paths
    # - fix path to rocm_agent_enumerator
    # - fix hcc path
    # - fix hcc version parsing
    # - add linker flags for libhsa-runtime64 and hc_am since libhip_hcc
    #   refers to them.
    prePatch = ''
      for f in $(find bin -type f); do
        sed -e 's,#!/usr/bin/perl,#!${perl}/bin/perl,' \
            -e 's,#!/bin/bash,#!${stdenv.shell},' \
            -i "$f"
      done
  
      for f in $(find . -regex '.*\.cpp\|.*\.h\(pp\)?'); do
        if grep -q __hcc_workweek__ "$f" ; then
          substituteInPlace "$f" --replace '__hcc_workweek__' '${workweek}'
        fi
      done
  
      sed 's,#!/usr/bin/python,#!${python}/bin/python,' -i hip_prof_gen.py
  
      sed -e 's,$ROCM_AGENT_ENUM = "''${ROCM_PATH}/bin/rocm_agent_enumerator";,$ROCM_AGENT_ENUM = "${rocminfo}/bin/rocm_agent_enumerator";,' \
          -e "s,^\($HIP_LIB_PATH=\).*$,\1\"$out/lib\";," \
          -e 's,^\($HIP_CLANG_PATH=\).*$,\1"${clang}/bin";,' \
          -e 's,^\($DEVICE_LIB_PATH=\).*$,\1"${rocm-device-libs}/amdgcn/bitcode";,' \
          -e 's,^\($HIP_COMPILER=\).*$,\1"clang";,' \
          -e 's,^\($HIP_RUNTIME=\).*$,\1"ROCclr";,' \
          -e 's,^\([[:space:]]*$HSA_PATH=\).*$,\1"${rocm-runtime}";,'g \
          -e 's,\([[:space:]]*$HOST_OSNAME=\).*,\1"nixos";,' \
          -e 's,\([[:space:]]*$HOST_OSVER=\).*,\1"${lib.versions.majorMinor lib.version}";,' \
          -e 's,^\([[:space:]]*\)$HIP_CLANG_INCLUDE_PATH = abs_path("$HIP_CLANG_PATH/../lib/clang/$HIP_CLANG_VERSION/include");,\1$HIP_CLANG_INCLUDE_PATH = "${clang-unwrapped}/lib/clang/$HIP_CLANG_VERSION/include";,' \
          -e 's,^\([[:space:]]*$HIPCXXFLAGS .= " -isystem $HIP_CLANG_INCLUDE_PATH\)";,\1 -isystem ${rocm-runtime}/include";,' \
          -e 's,\($HIPCXXFLAGS .= " -isystem \\"$HIP_INCLUDE_PATH\\"\)" ;,\1 --rocm-path=${rocclr}";,' \
          -e "s,\$HIP_PATH/\(bin\|lib\),$out/\1,g" \
          -e "s,^\$HIP_LIB_PATH=\$ENV{'HIP_LIB_PATH'};,\$HIP_LIB_PATH=\"$out/lib\";," \
          -e 's,`file,`${file}/bin/file,g' \
          -e 's,`readelf,`${binutils-unwrapped}/bin/readelf,' \
          -e 's, ar , ${binutils-unwrapped}/bin/ar ,g' \
          -i bin/hipcc
  
      sed -e 's,^\($HSA_PATH=\).*$,\1"${rocm-runtime}";,' \
          -e 's,^\($HIP_CLANG_PATH=\).*$,\1"${clang}/bin";,' \
          -e 's,^\($HIP_PLATFORM=\).*$,\1"amd";,' \
          -e 's,$HIP_CLANG_PATH/llc,${llvm}/bin/llc,' \
          -e 's, abs_path, Cwd::abs_path,' \
          -i bin/hipconfig
  
      sed -e 's, abs_path, Cwd::abs_path,' -i bin/hipvars.pm
  
      sed -e 's|_IMPORT_PREFIX}/../include|_IMPORT_PREFIX}/include|g' \
          -e 's|''${HIP_CLANG_ROOT}/lib/clang/\*/include|${clang-unwrapped}/lib/clang/*/include|' \
          -i hip-config.cmake.in
    '';
  
    preInstall = ''
      mkdir -p $out/lib/cmake
    '';
  
    # The upstream ROCclr setup wants everything built into the same
    # ROCclr output directory. We copy things into the HIP output
    # directory, since it is downstream of ROCclr in terms of dependency
    # direction. Thus we have device-libs and rocclr pieces in the HIP
    # output directory.
    postInstall = ''
      mkdir -p $out/share
      mv $out/lib/cmake $out/share/
      mv $out/cmake/* $out/share/cmake/hip
      mkdir -p $out/lib
      ln -s ${rocm-device-libs}/lib $out/lib/bitcode
      mkdir -p $out/include
      ln -s ${clang-unwrapped}/lib/clang/11.0.0/include $out/include/clang
      ln -s ${rocclr}/lib/*.* $out/lib
      ln -s ${rocclr}/include/* $out/include
      wrapProgram $out/bin/hipcc --set HIP_PATH $out --set HSA_PATH ${rocm-runtime} --set HIP_CLANG_PATH ${clang}/bin --prefix PATH : ${lld}/bin --set NIX_CC_WRAPPER_TARGET_HOST_${stdenv.cc.suffixSalt} 1 --prefix NIX_LDFLAGS ' ' -L${compiler-rt}/lib --prefix NIX_LDFLAGS_FOR_TARGET ' ' -L${compiler-rt}/lib
      wrapProgram $out/bin/hipconfig --set HIP_PATH $out --set HSA_PATH ${rocm-runtime} --set HIP_CLANG_PATH ${clang}/bin
    '';
  
    passthru.updateScript = writeScript "update.sh" ''
      #!/usr/bin/env nix-shell
      #!nix-shell -i bash -p curl jq common-updater-scripts
      version="$(curl -sL "https://api.github.com/repos/ROCm-Developer-Tools/HIP/tags" | jq '.[].name | split("-") | .[1] | select( . != null )' --raw-output | sort -n | tail -1)"
      update-source-version hip "$version"
    '';
  
    meta = with lib; {
      description = "C++ Heterogeneous-Compute Interface for Portability";
      homepage = "https://github.com/ROCm-Developer-Tools/HIP";
      license = licenses.mit;
      maintainers = with maintainers; [ lovesegfault ];
      platforms = platforms.linux;
  
negative.code: , fetchpatch
  , file
  , lib
  , libglvnd
  , libX11
  , libxml2
  , lld
  , llvm
  , makeWrapper
  , numactl
  , perl
  , python
  , rocclr
  