diff -Nuar a/cmake/FindPackageHandleStandardArgs.cmake b/cmake/FindPackageHandleStandardArgs.cmake
--- a/cmake/FindPackageHandleStandardArgs.cmake	1970-01-01 01:00:00.000000000 +0100
+++ b/cmake/FindPackageHandleStandardArgs.cmake	2020-03-04 11:38:51.062021412 +0100
@@ -0,0 +1,258 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageMessage.cmake)
+
+# internal helper macro
+macro(_FPHSA_FAILURE_MESSAGE _msg)
+  if (${_NAME}_FIND_REQUIRED)
+    message(FATAL_ERROR "${_msg}")
+  else ()
+    if (NOT ${_NAME}_FIND_QUIETLY)
+      message(STATUS "${_msg}")
+    endif ()
+  endif ()
+endmacro()
+
+
+# internal helper macro to generate the failure message when used in CONFIG_MODE:
+macro(_FPHSA_HANDLE_FAILURE_CONFIG_MODE)
+  # <PackageName>_CONFIG is set, but FOUND is false, this means that some other of the REQUIRED_VARS was not found:
+  if(${_NAME}_CONFIG)
+    _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: missing:${MISSING_VARS} (found ${${_NAME}_CONFIG} ${VERSION_MSG})")
+  else()
+    # If _CONSIDERED_CONFIGS is set, the config-file has been found, but no suitable version.
+    # List them all in the error message:
+    if(${_NAME}_CONSIDERED_CONFIGS)
+      set(configsText "")
+      list(LENGTH ${_NAME}_CONSIDERED_CONFIGS configsCount)
+      math(EXPR configsCount "${configsCount} - 1")
+      foreach(currentConfigIndex RANGE ${configsCount})
+        list(GET ${_NAME}_CONSIDERED_CONFIGS ${currentConfigIndex} filename)
+        list(GET ${_NAME}_CONSIDERED_VERSIONS ${currentConfigIndex} version)
+        string(APPEND configsText "    ${filename} (version ${version})\n")
+      endforeach()
+      if (${_NAME}_NOT_FOUND_MESSAGE)
+        string(APPEND configsText "    Reason given by package: ${${_NAME}_NOT_FOUND_MESSAGE}\n")
+      endif()
+      _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} ${VERSION_MSG}, checked the following files:\n${configsText}")
+
+    else()
+      # Simple case: No Config-file was found at all:
+      _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: found neither ${_NAME}Config.cmake nor ${_NAME_LOWER}-config.cmake ${VERSION_MSG}")
+    endif()
+  endif()
+endmacro()
+
+
+function(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG)
+
+# Set up the arguments for `cmake_parse_arguments`.
+  set(options  CONFIG_MODE  HANDLE_COMPONENTS)
+  set(oneValueArgs  FAIL_MESSAGE  VERSION_VAR  FOUND_VAR)
+  set(multiValueArgs REQUIRED_VARS)
+
+# Check whether we are in 'simple' or 'extended' mode:
+  set(_KEYWORDS_FOR_EXTENDED_MODE  ${options} ${oneValueArgs} ${multiValueArgs} )
+  list(FIND _KEYWORDS_FOR_EXTENDED_MODE "${_FIRST_ARG}" INDEX)
+
+  if(${INDEX} EQUAL -1)
+    set(FPHSA_FAIL_MESSAGE ${_FIRST_ARG})
+    set(FPHSA_REQUIRED_VARS ${ARGN})
+    set(FPHSA_VERSION_VAR)
+  else()
+    cmake_parse_arguments(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}"  ${_FIRST_ARG} ${ARGN})
+
+    if(FPHSA_UNPARSED_ARGUMENTS)
+      message(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"")
+    endif()
+
+    if(NOT FPHSA_FAIL_MESSAGE)
+      set(FPHSA_FAIL_MESSAGE  "DEFAULT_MSG")
+    endif()
+
+    # In config-mode, we rely on the variable <PackageName>_CONFIG, which is set by find_package()
+    # when it successfully found the config-file, including version checking:
+    if(FPHSA_CONFIG_MODE)
+      list(INSERT FPHSA_REQUIRED_VARS 0 ${_NAME}_CONFIG)
+      list(REMOVE_DUPLICATES FPHSA_REQUIRED_VARS)
+      set(FPHSA_VERSION_VAR ${_NAME}_VERSION)
+    endif()
+
+    if(NOT FPHSA_REQUIRED_VARS)
+      message(FATAL_ERROR "No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()")
+    endif()
+  endif()
+
+# now that we collected all arguments, process them
+
+  if("x${FPHSA_FAIL_MESSAGE}" STREQUAL "xDEFAULT_MSG")
+    set(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
+  endif()
+
+  list(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
+
+  string(TOUPPER ${_NAME} _NAME_UPPER)
+  string(TOLOWER ${_NAME} _NAME_LOWER)
+
+  if(FPHSA_FOUND_VAR)
+    if(FPHSA_FOUND_VAR MATCHES "^${_NAME}_FOUND$"  OR  FPHSA_FOUND_VAR MATCHES "^${_NAME_UPPER}_FOUND$")
+      set(_FOUND_VAR ${FPHSA_FOUND_VAR})
+    else()
+      message(FATAL_ERROR "The argument for FOUND_VAR is \"${FPHSA_FOUND_VAR}\", but only \"${_NAME}_FOUND\" and \"${_NAME_UPPER}_FOUND\" are valid names.")
+    endif()
+  else()
+    set(_FOUND_VAR ${_NAME_UPPER}_FOUND)
+  endif()
+
+  # collect all variables which were not found, so they can be printed, so the
+  # user knows better what went wrong (#6375)
+  set(MISSING_VARS "")
+  set(DETAILS "")
+  # check if all passed variables are valid
+  set(FPHSA_FOUND_${_NAME} TRUE)
+  foreach(_CURRENT_VAR ${FPHSA_REQUIRED_VARS})
+    if(NOT ${_CURRENT_VAR})
+      set(FPHSA_FOUND_${_NAME} FALSE)
+      string(APPEND MISSING_VARS " ${_CURRENT_VAR}")
+    else()
+      string(APPEND DETAILS "[${${_CURRENT_VAR}}]")
+    endif()
+  endforeach()
+  if(FPHSA_FOUND_${_NAME})
+    set(${_NAME}_FOUND TRUE)
+    set(${_NAME_UPPER}_FOUND TRUE)
+  else()
+    set(${_NAME}_FOUND FALSE)
+    set(${_NAME_UPPER}_FOUND FALSE)
+  endif()
+
+  # component handling
+  unset(FOUND_COMPONENTS_MSG)
+  unset(MISSING_COMPONENTS_MSG)
+
+  if(FPHSA_HANDLE_COMPONENTS)
+    foreach(comp ${${_NAME}_FIND_COMPONENTS})
+      if(${_NAME}_${comp}_FOUND)
+
+        if(NOT DEFINED FOUND_COMPONENTS_MSG)
+          set(FOUND_COMPONENTS_MSG "found components: ")
+        endif()
+        string(APPEND FOUND_COMPONENTS_MSG " ${comp}")
+
+      else()
+
+        if(NOT DEFINED MISSING_COMPONENTS_MSG)
+          set(MISSING_COMPONENTS_MSG "missing components: ")
+        endif()
+        string(APPEND MISSING_COMPONENTS_MSG " ${comp}")
+
+        if(${_NAME}_FIND_REQUIRED_${comp})
+          set(${_NAME}_FOUND FALSE)
+          string(APPEND MISSING_VARS " ${comp}")
+        endif()
+
+      endif()
+    endforeach()
+    set(COMPONENT_MSG "${FOUND_COMPONENTS_MSG} ${MISSING_COMPONENTS_MSG}")
+    string(APPEND DETAILS "[c${COMPONENT_MSG}]")
+  endif()
+
+  # version handling:
+  set(VERSION_MSG "")
+  set(VERSION_OK TRUE)
+
+  # check with DEFINED here as the requested or found version may be "0"
+  if (DEFINED ${_NAME}_FIND_VERSION)
+    if(DEFINED ${FPHSA_VERSION_VAR})
+      set(_FOUND_VERSION ${${FPHSA_VERSION_VAR}})
+
+      if(${_NAME}_FIND_VERSION_EXACT)       # exact version required
+        # count the dots in the version string
+        string(REGEX REPLACE "[^.]" "" _VERSION_DOTS "${_FOUND_VERSION}")
+        # add one dot because there is one dot more than there are components
+        string(LENGTH "${_VERSION_DOTS}." _VERSION_DOTS)
+        if (_VERSION_DOTS GREATER ${_NAME}_FIND_VERSION_COUNT)
+          # Because of the C++ implementation of find_package() ${_NAME}_FIND_VERSION_COUNT
+          # is at most 4 here. Therefore a simple lookup table is used.
+          if (${_NAME}_FIND_VERSION_COUNT EQUAL 1)
+            set(_VERSION_REGEX "[^.]*")
+          elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 2)
+            set(_VERSION_REGEX "[^.]*\\.[^.]*")
+          elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 3)
+            set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*")
+          else ()
+            set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*\\.[^.]*")
+          endif ()
+          string(REGEX REPLACE "^(${_VERSION_REGEX})\\..*" "\\1" _VERSION_HEAD "${_FOUND_VERSION}")
+          unset(_VERSION_REGEX)
+          if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _VERSION_HEAD)
+            set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
+            set(VERSION_OK FALSE)
+          else ()
+            set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
+          endif ()
+          unset(_VERSION_HEAD)
+        else ()
+          if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _FOUND_VERSION)
+            set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
+            set(VERSION_OK FALSE)
+          else ()
+            set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
+          endif ()
+        endif ()
+        unset(_VERSION_DOTS)
+
+      else()     # minimum version specified:
+        if (${_NAME}_FIND_VERSION VERSION_GREATER _FOUND_VERSION)
+          set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
+          set(VERSION_OK FALSE)
+        else ()
+          set(VERSION_MSG "(found suitable version \"${_FOUND_VERSION}\", minimum required is \"${${_NAME}_FIND_VERSION}\")")
+        endif ()
+      endif()
+
+    else()
+
+      # if the package was not found, but a version was given, add that to the output:
+      if(${_NAME}_FIND_VERSION_EXACT)
+         set(VERSION_MSG "(Required is exact version \"${${_NAME}_FIND_VERSION}\")")
+      else()
+         set(VERSION_MSG "(Required is at least version \"${${_NAME}_FIND_VERSION}\")")
+      endif()
+
+    endif()
+  else ()
+    # Check with DEFINED as the found version may be 0.
+    if(DEFINED ${FPHSA_VERSION_VAR})
+      set(VERSION_MSG "(found version \"${${FPHSA_VERSION_VAR}}\")")
+    endif()
+  endif ()
+
+  if(VERSION_OK)
+    string(APPEND DETAILS "[v${${FPHSA_VERSION_VAR}}(${${_NAME}_FIND_VERSION})]")
+  else()
+    set(${_NAME}_FOUND FALSE)
+  endif()
+
+
+  # print the result:
+  if (${_NAME}_FOUND)
+    FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_FIRST_REQUIRED_VAR}} ${VERSION_MSG} ${COMPONENT_MSG}" "${DETAILS}")
+  else ()
+
+    if(FPHSA_CONFIG_MODE)
+      _FPHSA_HANDLE_FAILURE_CONFIG_MODE()
+    else()
+      if(NOT VERSION_OK)
+        _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
+      else()
+        _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} (missing:${MISSING_VARS}) ${VERSION_MSG}")
+      endif()
+    endif()
+
+  endif ()
+
+  set(${_NAME}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
+  set(${_NAME_UPPER}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
+endfunction()
diff -Nuar a/cmake/FindPackageMessage.cmake b/cmake/FindPackageMessage.cmake
--- a/cmake/FindPackageMessage.cmake	1970-01-01 01:00:00.000000000 +0100
+++ b/cmake/FindPackageMessage.cmake	2020-03-04 11:38:51.062021412 +0100
@@ -0,0 +1,19 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+function(find_package_message pkg msg details)
+  # Avoid printing a message repeatedly for the same find result.
+  if(NOT ${pkg}_FIND_QUIETLY)
+    string(REPLACE "\n" "" details "${details}")
+    set(DETAILS_VAR FIND_PACKAGE_MESSAGE_DETAILS_${pkg})
+    if(NOT "${details}" STREQUAL "${${DETAILS_VAR}}")
+      # The message has not yet been printed.
+      message(STATUS "${msg}")
+
+      # Save the find details in the cache to avoid printing the same
+      # message again.
+      set("${DETAILS_VAR}" "${details}"
+        CACHE INTERNAL "Details about finding ${pkg}")
+    endif()
+  endif()
+endfunction()
diff -Nuar a/cmake/FindRuby.cmake b/cmake/FindRuby.cmake
--- a/cmake/FindRuby.cmake	2017-02-09 10:33:45.000000000 +0100
+++ b/cmake/FindRuby.cmake	2020-03-04 11:38:51.062021412 +0100
@@ -1,89 +1,297 @@
-# Ruby cmake package
-#
-# Returns
-# RUBY_FOUND
-# RUBY_INCLUDE_DIRS
-# RUBY_LIBRARIES
-# RUBY_VERSION_MAJOR
-# RUBY_VERSION_MINOR
-# RUBY_VERSION_STRING
-
-if(RUBY_FOUND)
-   set(RUBY_FIND_QUIETLY TRUE)
-endif()
-
-find_program(RUBY_EXECUTABLE
-  NAMES ruby2.2 ruby22 ruby2.1 ruby21 ruby2.0 ruby2 ruby1.9.3 ruby193 ruby1.9.2 ruby192 ruby1.9.1 ruby191 ruby1.9 ruby19 ruby1.8 ruby18 ruby
-  PATHS /usr/bin /usr/local/bin /usr/pkg/bin
-  )
-if(RUBY_EXECUTABLE)
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['MAJOR']"
-    OUTPUT_VARIABLE RUBY_VERSION_MAJOR
-    )
-
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['MINOR']"
-    OUTPUT_VARIABLE RUBY_VERSION_MINOR
-    )
-
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['TEENY']"
-    OUTPUT_VARIABLE RUBY_VERSION_TEENY
-    )
-  set(RUBY_VERSION_STRING ${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_TEENY})
-
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['rubyhdrdir'] || RbConfig::CONFIG['archdir']"
-    OUTPUT_VARIABLE RUBY_ARCH_DIR
-    )
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['arch']"
-    OUTPUT_VARIABLE RUBY_ARCH
-    )
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['libdir']"
-    OUTPUT_VARIABLE RUBY_POSSIBLE_LIB_PATH
-    )
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['rubylibdir']"
-    OUTPUT_VARIABLE RUBY_LIB_PATH
-    )
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['archincludedir']"
-    OUTPUT_VARIABLE RUBY_ARCH_INC_DIR
-    )
-  execute_process(
-    COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['RUBY_SO_NAME']"
-    OUTPUT_VARIABLE RUBY_SO_NAME
-    )
-
-  find_path(RUBY_INCLUDE_DIRS
-    NAMES ruby.h ruby/config.h
-    PATHS ${RUBY_ARCH_DIR}
-    )
-  set(RUBY_INCLUDE_ARCH "${RUBY_INCLUDE_DIRS}/${RUBY_ARCH}")
-  find_library(RUBY_LIB
-    NAMES ${RUBY_SO_NAME}
-    PATHS ${RUBY_POSSIBLE_LIB_PATH} ${RUBY_RUBY_LIB_PATH}
-    )
-
-  if(RUBY_LIB AND RUBY_INCLUDE_DIRS)
-    set(RUBY_FOUND TRUE)
-    set(RUBY_INCLUDE_DIRS "${RUBY_INCLUDE_DIRS};${RUBY_INCLUDE_ARCH};${RUBY_ARCH_INC_DIR}/ruby-${RUBY_VERSION_STRING}")
-    set(RUBY_LIBRARIES ${RUBY_LIB})
-  endif()
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[[
+FindRuby
+--------
+
+This module finds if Ruby is installed and determines where the
+include files and libraries are.  Ruby 1.8, 1.9, 2.0 through 2.5 are
+supported.
+
+The minimum required version of Ruby can be specified using the
+standard syntax, e.g.  find_package(Ruby 1.8)
+
+It also determines what the name of the library is.  This code sets
+the following variables:
+
+RUBY_EXECUTABLE
+    full path to the ruby binary
+RUBY_INCLUDE_DIRS
+    include dirs to be used when using the ruby library
+RUBY_LIBRARY
+    full path to the ruby library
+RUBY_VERSION
+    the version of ruby which was found, e.g. "1.8.7"
+RUBY_FOUND
+    set to true if ruby ws found successfully
 
-  if(RUBY_OLD_VERSION)
-    set(RUBY_FOUND FALSE)
-    set(RUBY_NOT_FOUND TRUE)
+Also:
+
+RUBY_INCLUDE_PATH
+    same as RUBY_INCLUDE_DIRS, only provided for compatibility reasons, don't use it
+#]]
+
+#   RUBY_ARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"archdir"@:>@)'`
+#   RUBY_SITEARCHDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitearchdir"@:>@)'`
+#   RUBY_SITEDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"sitelibdir"@:>@)'`
+#   RUBY_LIBDIR=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"libdir"@:>@)'`
+#   RUBY_LIBRUBYARG=`$RUBY -r rbconfig -e 'printf("%s",Config::CONFIG@<:@"LIBRUBYARG_SHARED"@:>@)'`
+
+# uncomment the following line to get debug output for this file
+set(_RUBY_DEBUG_OUTPUT TRUE)
+
+# Determine the list of possible names of the ruby executable depending
+# on which version of ruby is required
+set(_RUBY_POSSIBLE_EXECUTABLE_NAMES ruby)
+
+# if 1.9 is required, don't look for ruby18 and ruby1.8, default to version 1.8
+if(DEFINED Ruby_FIND_VERSION_MAJOR AND DEFINED Ruby_FIND_VERSION_MINOR)
+   set(Ruby_FIND_VERSION_SHORT_NODOT "${Ruby_FIND_VERSION_MAJOR}${RUBY_FIND_VERSION_MINOR}")
+   # we can't construct that if only major version is given
+   set(_RUBY_POSSIBLE_EXECUTABLE_NAMES
+       ruby${Ruby_FIND_VERSION_MAJOR}.${Ruby_FIND_VERSION_MINOR}
+       ruby${Ruby_FIND_VERSION_MAJOR}${Ruby_FIND_VERSION_MINOR}
+       ${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
+else()
+   set(Ruby_FIND_VERSION_SHORT_NODOT "18")
+endif()
+
+if(NOT Ruby_FIND_VERSION_EXACT)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.5 ruby25)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.4 ruby24)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.3 ruby23)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.2 ruby22)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.1 ruby21)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.0 ruby20)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.9 ruby19)
+
+  # if we want a version below 1.9, also look for ruby 1.8
+  if("${Ruby_FIND_VERSION_SHORT_NODOT}" VERSION_LESS "19")
+    list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.8 ruby18)
   endif()
 
-  mark_as_advanced(
-    RUBY_INCLUDE_DIRS
-    RUBY_LIBRARIES
-    RUBY_LIB
-    RUBY_VERSION_MAJOR RUBY_VERSION_MINOR
-    RUBY_VERSION_STRING
-    )
+  list(REMOVE_DUPLICATES _RUBY_POSSIBLE_EXECUTABLE_NAMES)
+endif()
+
+find_program(RUBY_EXECUTABLE NAMES ${_RUBY_POSSIBLE_EXECUTABLE_NAMES})
+
+if(RUBY_EXECUTABLE  AND NOT  RUBY_VERSION_MAJOR)
+  function(_RUBY_CONFIG_VAR RBVAR OUTVAR)
+    execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print RbConfig::CONFIG['${RBVAR}']"
+      RESULT_VARIABLE _RUBY_SUCCESS
+      OUTPUT_VARIABLE _RUBY_OUTPUT
+      ERROR_QUIET)
+    if(_RUBY_SUCCESS OR _RUBY_OUTPUT STREQUAL "")
+      execute_process(COMMAND ${RUBY_EXECUTABLE} -r rbconfig -e "print Config::CONFIG['${RBVAR}']"
+        RESULT_VARIABLE _RUBY_SUCCESS
+        OUTPUT_VARIABLE _RUBY_OUTPUT
+        ERROR_QUIET)
+    endif()
+    set(${OUTVAR} "${_RUBY_OUTPUT}" PARENT_SCOPE)
+  endfunction()
+
+
+  # query the ruby version
+   _RUBY_CONFIG_VAR("MAJOR" RUBY_VERSION_MAJOR)
+   _RUBY_CONFIG_VAR("MINOR" RUBY_VERSION_MINOR)
+   _RUBY_CONFIG_VAR("TEENY" RUBY_VERSION_PATCH)
+
+   # query the different directories
+   _RUBY_CONFIG_VAR("archdir" RUBY_ARCH_DIR)
+   _RUBY_CONFIG_VAR("arch" RUBY_ARCH)
+   _RUBY_CONFIG_VAR("rubyhdrdir" RUBY_HDR_DIR)
+   _RUBY_CONFIG_VAR("rubyarchhdrdir" RUBY_ARCHHDR_DIR)
+   _RUBY_CONFIG_VAR("libdir" RUBY_POSSIBLE_LIB_DIR)
+   _RUBY_CONFIG_VAR("rubylibdir" RUBY_RUBY_LIB_DIR)
+
+   # site_ruby
+   _RUBY_CONFIG_VAR("sitearchdir" RUBY_SITEARCH_DIR)
+   _RUBY_CONFIG_VAR("sitelibdir" RUBY_SITELIB_DIR)
+
+   # vendor_ruby available ?
+   execute_process(COMMAND ${RUBY_EXECUTABLE} -r vendor-specific -e "print 'true'"
+      OUTPUT_VARIABLE RUBY_HAS_VENDOR_RUBY  ERROR_QUIET)
+
+   if(RUBY_HAS_VENDOR_RUBY)
+      _RUBY_CONFIG_VAR("vendorlibdir" RUBY_VENDORLIB_DIR)
+      _RUBY_CONFIG_VAR("vendorarchdir" RUBY_VENDORARCH_DIR)
+   endif()
+
+   # save the results in the cache so we don't have to run ruby the next time again
+   set(RUBY_VERSION_MAJOR    ${RUBY_VERSION_MAJOR}    CACHE PATH "The Ruby major version" FORCE)
+   set(RUBY_VERSION_MINOR    ${RUBY_VERSION_MINOR}    CACHE PATH "The Ruby minor version" FORCE)
+   set(RUBY_VERSION_PATCH    ${RUBY_VERSION_PATCH}    CACHE PATH "The Ruby patch version" FORCE)
+   set(RUBY_ARCH_DIR         ${RUBY_ARCH_DIR}         CACHE PATH "The Ruby arch dir" FORCE)
+   set(RUBY_HDR_DIR          ${RUBY_HDR_DIR}          CACHE PATH "The Ruby header dir (1.9+)" FORCE)
+   set(RUBY_ARCHHDR_DIR      ${RUBY_ARCHHDR_DIR}      CACHE PATH "The Ruby arch header dir (2.0+)" FORCE)
+   set(RUBY_POSSIBLE_LIB_DIR ${RUBY_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir" FORCE)
+   set(RUBY_RUBY_LIB_DIR     ${RUBY_RUBY_LIB_DIR}     CACHE PATH "The Ruby ruby-lib dir" FORCE)
+   set(RUBY_SITEARCH_DIR     ${RUBY_SITEARCH_DIR}     CACHE PATH "The Ruby site arch dir" FORCE)
+   set(RUBY_SITELIB_DIR      ${RUBY_SITELIB_DIR}      CACHE PATH "The Ruby site lib dir" FORCE)
+   set(RUBY_HAS_VENDOR_RUBY  ${RUBY_HAS_VENDOR_RUBY}  CACHE BOOL "Vendor Ruby is available" FORCE)
+   set(RUBY_VENDORARCH_DIR   ${RUBY_VENDORARCH_DIR}   CACHE PATH "The Ruby vendor arch dir" FORCE)
+   set(RUBY_VENDORLIB_DIR    ${RUBY_VENDORLIB_DIR}    CACHE PATH "The Ruby vendor lib dir" FORCE)
+
+   mark_as_advanced(
+     RUBY_ARCH_DIR
+     RUBY_ARCH
+     RUBY_HDR_DIR
+     RUBY_ARCHHDR_DIR
+     RUBY_POSSIBLE_LIB_DIR
+     RUBY_RUBY_LIB_DIR
+     RUBY_SITEARCH_DIR
+     RUBY_SITELIB_DIR
+     RUBY_HAS_VENDOR_RUBY
+     RUBY_VENDORARCH_DIR
+     RUBY_VENDORLIB_DIR
+     RUBY_VERSION_MAJOR
+     RUBY_VERSION_MINOR
+     RUBY_VERSION_PATCH
+     )
+endif()
+
+# In case RUBY_EXECUTABLE could not be executed (e.g. cross compiling)
+# try to detect which version we found. This is not too good.
+if(RUBY_EXECUTABLE AND NOT RUBY_VERSION_MAJOR)
+   # by default assume 1.8.0
+   set(RUBY_VERSION_MAJOR 1)
+   set(RUBY_VERSION_MINOR 8)
+   set(RUBY_VERSION_PATCH 0)
+   # check whether we found 1.9.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby1\\.?9")
+      set(RUBY_VERSION_MAJOR 1)
+      set(RUBY_VERSION_MINOR 9)
+   endif()
+   # check whether we found 2.0.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?0")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 0)
+   endif()
+   # check whether we found 2.1.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?1")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 1)
+   endif()
+   # check whether we found 2.2.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?2")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 2)
+   endif()
+   # check whether we found 2.3.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?3")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 3)
+   endif()
+   # check whether we found 2.4.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?4")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 4)
+   endif()
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?5")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 5)
+   endif()
 endif()
+
+if(RUBY_VERSION_MAJOR)
+   set(RUBY_VERSION "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}.${RUBY_VERSION_PATCH}")
+   set(_RUBY_VERSION_SHORT "${RUBY_VERSION_MAJOR}.${RUBY_VERSION_MINOR}")
+   set(_RUBY_VERSION_SHORT_NODOT "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}")
+   set(_RUBY_NODOT_VERSION "${RUBY_VERSION_MAJOR}${RUBY_VERSION_MINOR}${RUBY_VERSION_PATCH}")
+endif()
+
+find_path(RUBY_INCLUDE_DIR
+   NAMES ruby.h
+   HINTS
+   ${RUBY_HDR_DIR}
+   ${RUBY_ARCH_DIR}
+   /usr/lib/ruby/${_RUBY_VERSION_SHORT}/i586-linux-gnu/ )
+
+set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIR} )
+
+# if ruby > 1.8 is required or if ruby > 1.8 was found, search for the config.h dir
+if( "${Ruby_FIND_VERSION_SHORT_NODOT}" GREATER 18  OR  "${_RUBY_VERSION_SHORT_NODOT}" GREATER 18  OR  RUBY_HDR_DIR)
+   find_path(RUBY_CONFIG_INCLUDE_DIR
+     NAMES ruby/config.h  config.h
+     HINTS
+     ${RUBY_HDR_DIR}/${RUBY_ARCH}
+     ${RUBY_ARCH_DIR}
+     ${RUBY_ARCHHDR_DIR}
+     )
+
+   set(RUBY_INCLUDE_DIRS ${RUBY_INCLUDE_DIRS} ${RUBY_CONFIG_INCLUDE_DIR} )
+endif()
+
+
+# Determine the list of possible names for the ruby library
+set(_RUBY_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_RUBY_VERSION_SHORT} ruby${_RUBY_VERSION_SHORT_NODOT} ruby-${_RUBY_VERSION_SHORT} ruby-${RUBY_VERSION})
+
+if(WIN32)
+   set( _RUBY_MSVC_RUNTIME "" )
+   if( MSVC_VERSION EQUAL 1200 )
+     set( _RUBY_MSVC_RUNTIME "60" )
+   endif()
+   if( MSVC_VERSION EQUAL 1300 )
+     set( _RUBY_MSVC_RUNTIME "70" )
+   endif()
+   if( MSVC_VERSION EQUAL 1310 )
+     set( _RUBY_MSVC_RUNTIME "71" )
+   endif()
+   if( MSVC_VERSION EQUAL 1400 )
+     set( _RUBY_MSVC_RUNTIME "80" )
+   endif()
+   if( MSVC_VERSION EQUAL 1500 )
+     set( _RUBY_MSVC_RUNTIME "90" )
+   endif()
+
+   set(_RUBY_ARCH_PREFIX "")
+   if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+     set(_RUBY_ARCH_PREFIX "x64-")
+   endif()
+
+   list(APPEND _RUBY_POSSIBLE_LIB_NAMES
+               "${_RUBY_ARCH_PREFIX}msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}"
+               "${_RUBY_ARCH_PREFIX}msvcr${_RUBY_MSVC_RUNTIME}-ruby${_RUBY_NODOT_VERSION}-static"
+               "${_RUBY_ARCH_PREFIX}msvcrt-ruby${_RUBY_NODOT_VERSION}"
+               "${_RUBY_ARCH_PREFIX}msvcrt-ruby${_RUBY_NODOT_VERSION}-static" )
+endif()
+
+find_library(RUBY_LIBRARY NAMES ${_RUBY_POSSIBLE_LIB_NAMES} HINTS ${RUBY_POSSIBLE_LIB_DIR} )
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+set(_RUBY_REQUIRED_VARS RUBY_EXECUTABLE RUBY_INCLUDE_DIR RUBY_LIBRARY)
+if(_RUBY_VERSION_SHORT_NODOT GREATER 18)
+   list(APPEND _RUBY_REQUIRED_VARS RUBY_CONFIG_INCLUDE_DIR)
+endif()
+
+if(_RUBY_DEBUG_OUTPUT)
+   message(STATUS "--------FindRuby.cmake debug------------")
+   message(STATUS "_RUBY_POSSIBLE_EXECUTABLE_NAMES: ${_RUBY_POSSIBLE_EXECUTABLE_NAMES}")
+   message(STATUS "_RUBY_POSSIBLE_LIB_NAMES: ${_RUBY_POSSIBLE_LIB_NAMES}")
+   message(STATUS "RUBY_ARCH_DIR: ${RUBY_ARCH_DIR}")
+   message(STATUS "RUBY_HDR_DIR: ${RUBY_HDR_DIR}")
+   message(STATUS "RUBY_POSSIBLE_LIB_DIR: ${RUBY_POSSIBLE_LIB_DIR}")
+   message(STATUS "Found RUBY_VERSION: \"${RUBY_VERSION}\" , short: \"${_RUBY_VERSION_SHORT}\", nodot: \"${_RUBY_VERSION_SHORT_NODOT}\"")
+   message(STATUS "_RUBY_REQUIRED_VARS: ${_RUBY_REQUIRED_VARS}")
+   message(STATUS "RUBY_EXECUTABLE: ${RUBY_EXECUTABLE}")
+   message(STATUS "RUBY_LIBRARY: ${RUBY_LIBRARY}")
+   message(STATUS "RUBY_INCLUDE_DIR: ${RUBY_INCLUDE_DIR}")
+   message(STATUS "RUBY_CONFIG_INCLUDE_DIR: ${RUBY_CONFIG_INCLUDE_DIR}")
+   message(STATUS "--------------------")
+endif()
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Ruby  REQUIRED_VARS  ${_RUBY_REQUIRED_VARS}
+                                        VERSION_VAR RUBY_VERSION )
+
+mark_as_advanced(
+  RUBY_EXECUTABLE
+  RUBY_LIBRARY
+  RUBY_INCLUDE_DIR
+  RUBY_CONFIG_INCLUDE_DIR
+  )
+
+# Set some variables for compatibility with previous version of this file
+set(RUBY_POSSIBLE_LIB_PATH ${RUBY_POSSIBLE_LIB_DIR})
+set(RUBY_RUBY_LIB_PATH ${RUBY_RUBY_LIB_DIR})
+set(RUBY_INCLUDE_PATH ${RUBY_INCLUDE_DIRS})