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diff --git a/extra/FindGPERF.cmake b/extra/FindGPERF.cmake
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+# - Find gperf executable and provides a macro to generate custom build rules
+#
+# The module defines the following variables:
+#  GPERF_FOUND - true is gperf executable is found
+#  GPERF_EXECUTABLE - the path to the gperf executable
+#  GPERF_VERSION - the version of gperf
+#  GPERF_LIBRARIES - The gperf libraries
+#
+# The minimum required version of gperf can be specified using the
+# standard syntax, e.g. FIND_PACKAGE(GPERF 2.5.13)
+#
+#
+# If gperf is found on the system, the module provides the macro:
+#  GPERF_TARGET(Name GperfInput GperfOutput [COMPILE_FLAGS <string>])
+# which creates a custom command  to generate the <GperfOutput> file from
+# the <GperfInput> file.  If  COMPILE_FLAGS option is specified, the next
+# parameter is added to the gperf  command line. Name is an alias used to
+# get  details of  this custom  command.  Indeed the  macro defines  the
+# following variables:
+#  GPERF_${Name}_DEFINED - true is the macro ran successfully
+#  GPERF_${Name}_OUTPUTS - the source file generated by the custom rule, an
+#  alias for GperfOutput
+#  GPERF_${Name}_INPUT - the gperf source file, an alias for ${GperfInput}
+#
+# Gperf scanners oftenly use tokens  defined by Bison: the code generated
+# by Gperf  depends of the header  generated by Bison.   This module also
+# defines a macro:
+#  ADD_GPERF_BISON_DEPENDENCY(GperfTarget BisonTarget)
+# which  adds the  required dependency  between a  scanner and  a parser
+# where  <GperfTarget>  and <BisonTarget>  are  the  first parameters  of
+# respectively GPERF_TARGET and BISON_TARGET macros.
+#
+#  ====================================================================
+#  Example:
+#
+#   find_package(GPERF)
+#
+#   GPERF_TARGET(MyHash hash.gperf  ${CMAKE_CURRENT_BINARY_DIR}/hash.c)
+#
+#  ====================================================================
+
+#=============================================================================
+# Copyright 2009 Kitware, Inc.
+# Copyright 2006 Tristan Carel
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+FIND_PROGRAM(GPERF_EXECUTABLE gperf DOC "path to the gperf executable")
+MARK_AS_ADVANCED(GPERF_EXECUTABLE)
+
+FIND_LIBRARY(FL_LIBRARY NAMES fl
+  DOC "path to the fl library")
+MARK_AS_ADVANCED(FL_LIBRARY)
+SET(GPERF_LIBRARIES ${FL_LIBRARY})
+
+IF(GPERF_EXECUTABLE)
+
+  EXECUTE_PROCESS(COMMAND ${GPERF_EXECUTABLE} --version
+    OUTPUT_VARIABLE GPERF_version_output
+    ERROR_VARIABLE GPERF_version_error
+    RESULT_VARIABLE GPERF_version_result
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  SET(ENV{LC_ALL} ${_Bison_SAVED_LC_ALL})
+
+  IF(NOT ${GPERF_version_result} EQUAL 0)
+    MESSAGE(SEND_ERROR "Command \"${GPERF_EXECUTABLE} --version\" failed with output:\n${GPERF_version_error}")
+  ELSE() 
+    STRING(REGEX REPLACE "^GNU gperf ([^\n]+)\n.*" "\\1"
+      GPERF_VERSION "${GPERF_version_output}")
+  ENDIF()
+
+  #============================================================
+  # GPERF_TARGET (public macro)
+  #============================================================
+  #
+  MACRO(GPERF_TARGET Name Input Output)
+    SET(GPERF_TARGET_usage "GPERF_TARGET(<Name> <Input> <Output> [COMPILE_FLAGS <string>]")
+    IF(${ARGC} GREATER 3)
+      IF(${ARGC} EQUAL 5)
+        IF("${ARGV3}" STREQUAL "COMPILE_FLAGS")
+          SET(GPERF_EXECUTABLE_opts  "${ARGV4}")
+          SEPARATE_ARGUMENTS(GPERF_EXECUTABLE_opts)
+        ELSE()
+          MESSAGE(SEND_ERROR ${GPERF_TARGET_usage})
+        ENDIF()
+      ELSE()
+        MESSAGE(SEND_ERROR ${GPERF_TARGET_usage})
+      ENDIF()
+    ENDIF()
+
+    ADD_CUSTOM_COMMAND(OUTPUT ${Output}
+      COMMAND ${GPERF_EXECUTABLE}
+      ARGS ${GPERF_EXECUTABLE_opts} < ${Input} > ${Output}
+      DEPENDS ${Input}
+      COMMENT "[GPERF][${Name}] Building hash with gperf ${GPERF_VERSION}"
+      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+
+    SET(GPERF_${Name}_DEFINED TRUE)
+    SET(GPERF_${Name}_OUTPUTS ${Output})
+    SET(GPERF_${Name}_INPUT ${Input})
+    SET(GPERF_${Name}_COMPILE_FLAGS ${GPERF_EXECUTABLE_opts})
+  ENDMACRO(GPERF_TARGET)
+  #============================================================
+
+
+  #============================================================
+  # ADD_GPERF_BISON_DEPENDENCY (public macro)
+  #============================================================
+  #
+  MACRO(ADD_GPERF_BISON_DEPENDENCY GperfTarget BisonTarget)
+
+    IF(NOT GPERF_${GperfTarget}_OUTPUTS)
+      MESSAGE(SEND_ERROR "Gperf target `${GperfTarget}' does not exists.")
+    ENDIF()
+
+    IF(NOT BISON_${BisonTarget}_OUTPUT_HEADER)
+      MESSAGE(SEND_ERROR "Bison target `${BisonTarget}' does not exists.")
+    ENDIF()
+
+    SET_SOURCE_FILES_PROPERTIES(${GPERF_${GperfTarget}_OUTPUTS}
+      PROPERTIES OBJECT_DEPENDS ${BISON_${BisonTarget}_OUTPUT_HEADER})
+  ENDMACRO(ADD_GPERF_BISON_DEPENDENCY)
+  #============================================================
+
+ENDIF(GPERF_EXECUTABLE)
+
+INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(GPERF REQUIRED_VARS GPERF_EXECUTABLE
+                                       VERSION_VAR GPERF_VERSION)
+
+# FindGPERF.cmake ends here