function(vcpkg_find_acquire_program VAR)
  if(${VAR} AND NOT ${VAR} MATCHES "-NOTFOUND")
    return()
  endif()

  unset(NOEXTRACT)
  unset(SUBDIR)
  unset(REQUIRED_INTERPRETER)

  vcpkg_get_program_files_platform_bitness(PROGRAM_FILES_PLATFORM_BITNESS)
  vcpkg_get_program_files_32_bit(PROGRAM_FILES_32_BIT)

  if(VAR MATCHES "PERL")
    set(PROGNAME perl)
    set(PATHS ${DOWNLOADS}/tools/perl/perl/bin)
    set(URL "http://strawberryperl.com/download/5.24.1.1/strawberry-perl-5.24.1.1-32bit-portable.zip")
    set(ARCHIVE "strawberry-perl-5.24.1.1-32bit-portable.zip")
    set(HASH a6e685ea24376f50db5f06c5b46075f1d3be25168fa1f27fa9b02e2ac017826cee62a2b43562f9b6c989337a231ba914416c110075457764de2d11f99d5e0f26)
  elseif(VAR MATCHES "NASM")
    set(PROGNAME nasm)
    set(PATHS ${DOWNLOADS}/tools/nasm/nasm-2.12.02)
    set(URL "http://www.nasm.us/pub/nasm/releasebuilds/2.12.02/win32/nasm-2.12.02-win32.zip")
    set(ARCHIVE "nasm-2.12.02-win32.zip")
    set(HASH df7aaba094e17832688c88993997612a2e2c96cc3dc14ca3e8347b44c7762115f5a7fc6d7f20be402553aaa4c9e43ddfcf6228f581cfe89289bae550de151b36)
  elseif(VAR MATCHES "YASM")
    set(PROGNAME yasm)
    set(PATHS ${DOWNLOADS}/tools/yasm)
    set(URL "http://www.tortall.net/projects/yasm/releases/yasm-1.3.0-win32.exe")
    set(ARCHIVE "yasm.exe")
    set(NOEXTRACT ON)
    set(HASH 850b26be5bbbdaeaf45ac39dd27f69f1a85e600c35afbd16b9f621396b3c7a19863ea3ff316b025b578fce0a8280eef2203306a2b3e46ee1389abb65313fb720)
  elseif(VAR MATCHES "PYTHON3")
    set(PROGNAME python)
    set(PATHS ${DOWNLOADS}/tools/python)
    set(URL "https://www.python.org/ftp/python/3.5.3/python-3.5.3-embed-win32.zip")
    set(ARCHIVE "python-3.5.3-embed-win32.zip")
    set(HASH c8cfdc09d052dc27e4380e8e4bf0d32a4c0def7e03896c1fa6cabc26dde78bb74dbb04e3673cc36e3e307d65a1ef284d69174f0cc80008c83bc6178f192ac5cf)
  elseif(VAR MATCHES "PYTHON2")
    find_program(PYTHON2 NAMES python2 python PATHS C:/python27 ENV PYTHON)
    if(NOT PYTHON2 MATCHES "NOTFOUND")
        execute_process(
            COMMAND ${PYTHON2} --version
            OUTPUT_VARIABLE PYTHON_VER_CHECK_OUT
            ERROR_VARIABLE PYTHON_VER_CHECK_ERR
        )
        set(PYTHON_VER_CHECK "${PYTHON_VER_CHECK_OUT}${PYTHON_VER_CHECK_ERR}")
        debug_message("PYTHON_VER_CHECK=${PYTHON_VER_CHECK}")
        if(NOT PYTHON_VER_CHECK MATCHES "Python 2.7")
            set(PYTHON2 PYTHON2-NOTFOUND)
            find_program(PYTHON2 NAMES python2 python PATHS C:/python27 ENV PYTHON NO_SYSTEM_ENVIRONMENT_PATH)
        endif()
    endif()
    if(PYTHON2 MATCHES "NOTFOUND")
        message(FATAL_ERROR "Python 2.7 was not found in the path or by searching inside C:\\Python27.\n"
        "There is no portable redistributable for Python 2.7, so you will need to install the MSI located at:\n"
        "    https://www.python.org/ftp/python/2.7.13/python-2.7.13.msi\n"
        )
    endif()
  elseif(VAR MATCHES "JOM")
    set(PROGNAME jom)
    set(SUBDIR "jom-1.1.2")
    set(PATHS ${DOWNLOADS}/tools/jom/${SUBDIR})
    set(URL "http://download.qt.io/official_releases/jom/jom_1_1_2.zip")
    set(ARCHIVE "jom_1_1_2.zip")
    set(HASH 830cd94ed6518fbe4604a0f5a3322671b4674b87d25a71349c745500d38e85c0fac4f6995242fc5521eb048e3966bb5ec2a96a06b041343ed8da9bba78124f34)
  elseif(VAR MATCHES "7Z")
    set(PROGNAME 7z)
    set(PATHS "${PROGRAM_FILES_PLATFORM_BITNESS}/7-Zip" "${PROGRAM_FILES_32_BIT}/7-Zip" ${DOWNLOADS}/tools/7z/Files/7-Zip)
    set(URL "http://7-zip.org/a/7z1604.msi")
    set(ARCHIVE "7z1604.msi")
    set(HASH 556f95f7566fe23704d136239e4cf5e2a26f939ab43b44145c91b70d031a088d553e5c21301f1242a2295dcde3143b356211f0108c68e65eef8572407618326d)
  elseif(VAR MATCHES "NINJA")
    set(PROGNAME ninja)
    set(SUBDIR "ninja-1.7.2")
    set(PATHS ${DOWNLOADS}/tools/ninja/${SUBDIR})
    set(URL "https://github.com/ninja-build/ninja/releases/download/v1.7.2/ninja-win.zip")
    set(ARCHIVE "ninja-win.zip")
    set(HASH cccab9281b274c564f9ad77a2115be1f19be67d7b2ee14a55d1db1b27f3b68db8e76076e4f804b61eb8e573e26a8ecc9985675a8dcf03fd7a77b7f57234f1393)
  elseif(VAR MATCHES "MESON")
    set(PROGNAME meson)
    set(REQUIRED_INTERPRETER PYTHON3)
    set(SCRIPTNAME meson.py)
    set(PATHS ${DOWNLOADS}/tools/meson/meson-0.38.1)
    set(URL "https://github.com/mesonbuild/meson/archive/0.38.1.zip")
    set(ARCHIVE "meson-0.38.1.zip")
    set(HASH 89642b1d976af7e29e9ca2b1a378510ce286ebd90a8234e898f3dd9dd7151538fdfc61fba770681605dad843b77b344fee94f992f18328655669d5f603c7fee5)
  else()
    message(FATAL "unknown tool ${VAR} -- unable to acquire.")
  endif()

  macro(do_find)
    if(NOT DEFINED REQUIRED_INTERPRETER)
      find_program(${VAR} ${PROGNAME} PATHS ${PATHS})
    else()
      vcpkg_find_acquire_program(${REQUIRED_INTERPRETER})
      find_file(SCIRPT ${SCRIPTNAME} PATHS ${PATHS})
      set(${VAR} ${${REQUIRED_INTERPRETER}} ${SCIRPT})
    endif()
  endmacro()

  do_find()
  if(${VAR} MATCHES "-NOTFOUND")
    file(DOWNLOAD ${URL} ${DOWNLOADS}/${ARCHIVE}
      EXPECTED_HASH SHA512=${HASH}
      SHOW_PROGRESS
    )
    file(MAKE_DIRECTORY ${DOWNLOADS}/tools/${PROGNAME}/${SUBDIR})
    if(DEFINED NOEXTRACT)
      file(COPY ${DOWNLOADS}/${ARCHIVE} DESTINATION ${DOWNLOADS}/tools/${PROGNAME}/${SUBDIR})
    else()
      get_filename_component(ARCHIVE_EXTENSION ${ARCHIVE} EXT)
      string(TOLOWER "${ARCHIVE_EXTENSION}" ARCHIVE_EXTENSION)
      if(${ARCHIVE_EXTENSION} STREQUAL ".msi")
        file(TO_NATIVE_PATH "${DOWNLOADS}/${ARCHIVE}" ARCHIVE_NATIVE_PATH)
        file(TO_NATIVE_PATH "${DOWNLOADS}/tools/${PROGNAME}/${SUBDIR}" DESTINATION_NATIVE_PATH)
        execute_process(
          COMMAND msiexec /a ${ARCHIVE_NATIVE_PATH} /qn TARGETDIR=${DESTINATION_NATIVE_PATH}
          WORKING_DIRECTORY ${DOWNLOADS}
        )
      else()
        execute_process(
          COMMAND ${CMAKE_COMMAND} -E tar xzf ${DOWNLOADS}/${ARCHIVE}
          WORKING_DIRECTORY ${DOWNLOADS}/tools/${PROGNAME}/${SUBDIR}
        )
      endif()
    endif()

    do_find()
  endif()

  set(${VAR} ${${VAR}} PARENT_SCOPE)
endfunction()