if(NOT SIGNALVIEW_IS_EXTERNAL_PROJECT)
  set(SIGNALVIEW_PREFIX "" CACHE PATH "The path to the prefix of an libsignalview installation")
  set(SIGNALVIEW_INCLUDE_DIR "" CACHE PATH "The path to the headers of an libsignalview installation")
  set(SIGNALVIEW_LIBRARY_DIR "" CACHE PATH "The path to the library of an libsignalview installation")

  set(_search_paths "")
  if(EXISTS SIGNALVIEW_INCLUDE_DIR)
    list(APPEND _search_paths ${SIGNALVIEW_INCLUDE_DIR})
  endif()
  if(EXISTS SIGNALVIEW_PREFIX)
    list(APPEND _search_paths ${SIGNALVIEW_PREFIX}/include)
  endif()
  find_path(
    SIGNALVIEW_INCLUDE_DIRS
    NAMES signalview/wndSignalView.hpp
    PATHS ${_search_paths})

  set(_search_paths "")
  if(EXISTS SIGNALVIEW_LIBRARY_DIR)
    list(APPEND _search_paths ${SIGNALVIEW_LIBRARY_DIR})
  endif()
  if(EXISTS SIGNALVIEW_PREFIX)
    list(APPEND _search_paths ${SIGNALVIEW_PREFIX}/lib)
  endif()
  find_library(
    SIGNALVIEW_LIBRARIES
    NAMES fsp
    PATHS ${_search_paths})
  unset(_search_paths)

  if(SIGNALVIEW_INCLUDE_DIRS AND SIGNALVIEW_LIBRARIES)
    set(SIGNALVIEW_FOUND TRUE)
  endif()

  if(SIGNALVIEW_FOUND)
    if(NOT SIGNALVIEW_FIND_QUIETLY)
      message(STATUS "Found libsignalview")
    endif()
    set(HAVE_SIGNALVIEW 1)
  elseif(SIGNALVIEW_FOUND)
    if(SIGNALVIEW_FIND_REQUIRED)
      message(FATAL_ERROR "Could not find libsignalview")
    endif()
  endif()
endif()