ENH: NEW: FindGTK2 module

1 files changed, 540 insertions, 0 deletions

diff --git a/Modules/FindGTK2.cmake b/Modules/FindGTK2.cmake
new file mode 100644
index 0000000000..6921269425
--- /dev/null
+++ b/Modules/FindGTK2.cmake
@@ -0,0 +1,540 @@
+# - FindGTK2.cmake
+# This module can find the GTK2 widget libraries and several of its other
+# optional components like gtkmm, glade, and glademm.
+#
+# NOTE: If you intend to use version checking, CMake 2.6.2 or later is
+#       required.
+#
+# Specify one or more of the following components
+# as you call this find module. See example below.
+#
+#   gtk
+#   gtkmm
+#   glade
+#   glademm
+#
+# The following variables will be defined for your use
+#
+#   GTK2_FOUND - Were all of your specified components found?
+#   GTK2_INCLUDE_DIRS - All include directories
+#   GTK2_LIBRARIES - All libraries
+#
+#   GTK2_VERSION - The version of GTK2 found (x.y.z)
+#   GTK2_MAJOR_VERSION - The major version of GTK2
+#   GTK2_MINOR_VERSION - The minor version of GTK2
+#   GTK2_PATCH_VERSION - The patch version of GTK2
+#
+# Optional variables you can define prior to calling this module:
+#
+#   GTK2_DEBUG - Enables verbose debugging of the module
+#   GTK2_SKIP_MARK_AS_ADVANCED - Disable marking cache variables as advanced
+#
+#=================
+# Example Usage:
+#
+#   Call find_package() once, here are some examples to pick from:
+#
+#   Require GTK 2.6 or later
+#       find_package(GTK2 2.6 REQUIRED gtk)
+#
+#   Require GTK 2.10 or later and Glade
+#       find_package(GTK2 2.10 REQUIRED gtk glade)
+#
+#   Search for GTK/GTKMM 2.8 or later
+#       find_package(GTK2 2.8 COMPONENTS gtk gtkmm)
+#
+#   if(GTK2_FOUND)
+#      include_directories(${GTK2_INCLUDE_DIRS})
+#      add_executable(mygui mygui.cc)
+#      target_link_libraries(mygui ${GTK2_LIBRARIES})
+#   endif()
+#
+#=================
+# 
+# Copyright (c) 2008-2009
+#     Philip Lowman <philip@yhbt.com>
+#
+# Version 0.7 (3/22/09)
+#   * Checked into CMake CVS
+#   * Added versioning support
+#   * Module now defaults to searching for GTK if COMPONENTS not specified.
+#   * Added HKCU prior to HKLM registry key and GTKMM specific environment
+#      variable as per mailing list discussion.
+#   * Added lib64 to include search path and a few other search paths where GTK
+#      may be installed on Unix systems.
+#   * Switched to lowercase CMake commands
+#   * Prefaced internal variables with _GTK2 to prevent collision
+#   * Changed internal macros to functions
+#   * Enhanced documentation
+# Version 0.6 (1/8/08)
+#   Added GTK2_SKIP_MARK_AS_ADVANCED option
+# Version 0.5 (12/19/08)
+#   Second release to cmake mailing list
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+
+#=============================================================
+# _GTK2_GET_VERSION
+# Internal function to parse the version number in gtkversion.h
+#   _OUT_major = Major version number
+#   _OUT_minor = Minor version number
+#   _OUT_micro = Micro version number
+#   _gtkversion_hdr = Header file to parse
+#=============================================================
+function(_GTK2_GET_VERSION _OUT_major _OUT_minor _OUT_micro _gtkversion_hdr)
+    file(READ ${_gtkversion_hdr} _contents)
+    if(_contents)
+        string(REGEX REPLACE ".*#define GTK_MAJOR_VERSION[ \t]+\\(([0-9]+)\\).*" "\\1" ${_OUT_major} "${_contents}")
+        string(REGEX REPLACE ".*#define GTK_MINOR_VERSION[ \t]+\\(([0-9]+)\\).*" "\\1" ${_OUT_minor} "${_contents}")
+        string(REGEX REPLACE ".*#define GTK_MICRO_VERSION[ \t]+\\(([0-9]+)\\).*" "\\1" ${_OUT_micro} "${_contents}")
+        
+        if(NOT ${_OUT_major} MATCHES "[0-9]+")
+            message(FATAL_ERROR "Version parsing failed for GTK2_MAJOR_VERSION!")
+        endif()
+        if(NOT ${_OUT_minor} MATCHES "[0-9]+")
+            message(FATAL_ERROR "Version parsing failed for GTK2_MINOR_VERSION!")
+        endif()
+        if(NOT ${_OUT_micro} MATCHES "[0-9]+")
+            message(FATAL_ERROR "Version parsing failed for GTK2_MICRO_VERSION!")
+        endif()
+
+        set(${_OUT_major} ${${_OUT_major}} PARENT_SCOPE)
+        set(${_OUT_minor} ${${_OUT_minor}} PARENT_SCOPE)
+        set(${_OUT_micro} ${${_OUT_micro}} PARENT_SCOPE)
+    else()
+        message(FATAL_ERROR "Include file ${_gtkversion_hdr} does not exist")
+    endif()
+endfunction()
+
+#=============================================================
+# _GTK2_FIND_INCLUDE_DIR
+# Internal function to find the GTK include directories
+#   _var = variable to set
+#   _hdr = header file to look for
+#=============================================================
+function(_GTK2_FIND_INCLUDE_DIR _var _hdr)
+
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}] "
+                       "_GTK2_FIND_INCLUDE_DIR( ${_var} ${_hdr} )")
+    endif()
+
+    set(_relatives
+        # FIXME
+        glibmm-2.4
+        glib-2.0
+        atk-1.0
+        atkmm-1.6
+        cairo
+        cairomm-1.0
+        gdkmm-2.4
+        giomm-2.4
+        gtk-2.0
+        gtkmm-2.4
+        libglade-2.0
+        libglademm-2.4
+        pango-1.0
+        pangomm-1.4
+        sigc++-2.0
+    )
+
+    set(_suffixes)
+    foreach(_d ${_relatives})
+        list(APPEND _suffixes ${_d})
+        list(APPEND _suffixes ${_d}/include) # for /usr/lib/gtk-2.0/include
+    endforeach()
+
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}]     "
+                       "include suffixes = ${_suffixes}")
+    endif()
+
+    find_path(${_var} ${_hdr}
+        PATHS
+            /usr/local/lib64
+            /usr/local/lib
+            /usr/lib64
+            /usr/lib
+            /opt/gnome/include
+            /opt/gnome/lib
+            /opt/openwin/include
+            /usr/openwin/lib
+            $ENV{GTKMM_BASEPATH}/include
+            $ENV{GTKMM_BASEPATH}/lib
+            [HKEY_CURRENT_USER\\SOFTWARE\\gtkmm\\2.4;Path]/include
+            [HKEY_CURRENT_USER\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+            [HKEY_LOCAL_MACHINE\\SOFTWARE\\gtkmm\\2.4;Path]/include
+            [HKEY_LOCAL_MACHINE\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+        PATH_SUFFIXES
+            ${_suffixes}
+    )
+
+    if(${_var})
+        set(GTK2_INCLUDE_DIRS ${GTK2_INCLUDE_DIRS} ${${_var}} PARENT_SCOPE)
+        if(NOT GTK2_SKIP_MARK_AS_ADVANCED)
+            mark_as_advanced(${_var})
+        endif()
+    endif()
+
+endfunction(_GTK2_FIND_INCLUDE_DIR)
+
+#=============================================================
+# _GTK2_FIND_LIBRARY
+# Internal function to find libraries packaged with GTK2
+#   _var = library variable to create
+#=============================================================
+function(_GTK2_FIND_LIBRARY _var _lib _expand_vc _append_version)
+
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}] "
+                       "_GTK2_FIND_LIBRARY( ${_var} ${_lib} ${_expand_vc} ${_append_version} )")
+    endif()
+
+    # Not GTK versions per se but the versions encoded into Windows
+    # import libraries (GtkMM 2.14.1 has a gtkmm-vc80-2_4.lib for example)
+    # Also the MSVC libraries use _ for . (this is handled below)
+    set(_versions 2.20 2.18 2.16 2.14 2.12
+                  2.10  2.8  2.6  2.4  2.2 2.0
+                  1.20 1.18 1.16 1.14 1.12
+                  1.10  1.8  1.6  1.4  1.2 1.0)
+
+    set(_library)
+    set(_library_d)
+
+    set(_library ${_lib})
+
+    if(_expand_vc)
+        # Add vc80/vc90 midfixes
+        if(MSVC80)
+            set(_library   ${_library}-vc80)
+            set(_library_d ${_library}-d)
+        elseif(MSVC90)
+            set(_library   ${_library}-vc90)
+            set(_library_d ${_library}-d)
+        endif()
+    endif()
+
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}]     "
+                       "After midfix addition = ${_library} and ${_library_d}")
+    endif()
+
+    set(_lib_list)
+    set(_libd_list)
+    if(_append_version)
+        foreach(_ver ${_versions})
+            list(APPEND _lib_list  "${_library}-${_ver}")
+            list(APPEND _libd_list "${_library_d}-${_ver}")
+        endforeach()
+    else()
+        set(_lib_list ${_library})
+        set(_libd_list ${_library_d})
+    endif()
+    
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}]     "
+                       "library list = ${_lib_list} and library debug list = ${_libd_list}")
+    endif()
+
+    # For some silly reason the MSVC libraries use _ instead of .
+    # in the version fields
+    if(_expand_vc AND MSVC)
+        set(_no_dots_lib_list)
+        set(_no_dots_libd_list)
+        foreach(_l ${_lib_list})
+            string(REPLACE "." "_" _no_dots_library ${_l})
+            list(APPEND _no_dots_lib_list ${_no_dots_library})
+        endforeach()
+        # And for debug
+        set(_no_dots_libsd_list)
+        foreach(_l ${_libd_list})
+            string(REPLACE "." "_" _no_dots_libraryd ${_l})
+            list(APPEND _no_dots_libd_list ${_no_dots_libraryd})
+        endforeach()
+
+        # Copy list back to original names
+        set(_lib_list ${_no_dots_lib_list})
+        set(_libd_list ${_no_dots_libd_list})
+    endif()
+
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}]     "
+                       "While searching for ${_var}, our proposed library list is ${_lib_list}")
+    endif()
+
+    find_library(${_var} 
+        NAMES ${_lib_list}
+        PATHS
+            /opt/gnome/lib
+            /opt/gnome/lib64
+            /usr/openwin/lib
+            /usr/openwin/lib64
+            $ENV{GTKMM_BASEPATH}/lib
+            [HKEY_CURRENT_USER\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+            [HKEY_LOCAL_MACHINE\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+        )
+
+    if(_expand_vc AND MSVC)
+        if(GTK2_DEBUG)
+            message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}]     "
+                           "While searching for ${_var}_DEBUG our proposed library list is ${_libd_list}")
+        endif()
+
+        find_library(${_var}_DEBUG
+            NAMES ${_libd_list}
+            PATHS
+            $ENV{GTKMM_BASEPATH}/lib
+            [HKEY_CURRENT_USER\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+            [HKEY_LOCAL_MACHINE\\SOFTWARE\\gtkmm\\2.4;Path]/lib
+        )
+
+        if(${_var} AND ${_var}_DEBUG)
+            if(NOT GTK2_SKIP_MARK_AS_ADVANCED)
+                mark_as_advanced(${_var}_DEBUG)
+            endif()
+            set(GTK2_LIBRARIES ${GTK2_LIBRARIES} optimized ${${_var}} debug ${${_var}_DEBUG})
+            set(GTK2_LIBRARIES ${GTK2_LIBRARIES} PARENT_SCOPE)
+        endif()
+    else()
+        if(NOT GTK2_SKIP_MARK_AS_ADVANCED)
+            mark_as_advanced(${_var})
+        endif()
+        set(GTK2_LIBRARIES ${GTK2_LIBRARIES} ${${_var}})
+        set(GTK2_LIBRARIES ${GTK2_LIBRARIES} PARENT_SCOPE)
+        # Set debug to release
+        set(${_var}_DEBUG ${${_var}})
+        set(${_var}_DEBUG ${${_var}} PARENT_SCOPE)
+    endif()
+endfunction(_GTK2_FIND_LIBRARY)
+
+#=============================================================
+
+#
+# main()
+#
+
+set(GTK2_FOUND)
+set(GTK2_INCLUDE_DIRS)
+set(GTK2_LIBRARIES)
+
+if(NOT GTK2_FIND_COMPONENTS)
+    # Assume they only want GTK
+    set(GTK2_FIND_COMPONENTS gtk)
+endif()
+
+#
+# If specified, enforce version number
+#
+if(GTK2_FIND_VERSION)
+    cmake_minimum_required(VERSION 2.6.2)
+    set(GTK2_FAILED_VERSION_CHECK true)
+    if(GTK2_DEBUG)
+        message(STATUS "[FindGTK2.cmake:${CMAKE_CURRENT_LIST_LINE}] "
+                       "Searching for version ${GTK2_FIND_VERSION}")
+    endif()
+    _GTK2_FIND_INCLUDE_DIR(GTK2_GTK_INCLUDE_DIR gtk/gtk.h)
+    if(GTK2_GTK_INCLUDE_DIR)
+        _GTK2_GET_VERSION(GTK2_MAJOR_VERSION
+                          GTK2_MINOR_VERSION
+                          GTK2_PATCH_VERSION
+                          ${GTK2_GTK_INCLUDE_DIR}/gtk/gtkversion.h)
+        set(GTK2_VERSION
+            ${GTK2_MAJOR_VERSION}.${GTK2_MINOR_VERSION}.${GTK2_PATCH_VERSION})
+        if(GTK2_FIND_VERSION_EXACT)
+            if(GTK2_VERSION VERSION_EQUAL GTK2_FIND_VERSION)
+                set(GTK2_FAILED_VERSION_CHECK false)
+            endif()
+        else()
+            if(GTK2_VERSION VERSION_EQUAL   GTK2_FIND_VERSION OR
+               GTK2_VERSION VERSION_GREATER GTK2_FIND_VERSION)
+                set(GTK2_FAILED_VERSION_CHECK false)
+            endif()
+        endif()
+    else()
+        # If we can't find the GTK include dir, we can't do version checking
+        if(GTK2_FIND_REQUIRED AND NOT GTK2_FIND_QUIETLY)
+            message(FATAL_ERROR "Could not find GTK2 include directory")
+        endif()
+        return()
+    endif()
+
+    if(GTK2_FAILED_VERSION_CHECK)
+        if(GTK2_FIND_REQUIRED AND NOT GTK2_FIND_QUIETLY)
+            if(GTK2_FIND_VERSION_EXACT)
+                message(FATAL_ERROR "GTK2 version check failed.  Version ${GTK2_VERSION} was found, version ${GTK2_FIND_VERSION} is needed exactly.")
+            else()
+                message(FATAL_ERROR "GTK2 version check failed.  Version ${GTK2_VERSION} was found, at least version ${GTK2_FIND_VERSION} is required")
+            endif()
+        endif()    
+        
+        # If the version check fails, exit out of the module here
+        return()
+    endif()
+endif()
+
+#
+# Find all components
+#
+
+foreach(_GTK2_component ${GTK2_FIND_COMPONENTS})
+    if(_GTK2_component STREQUAL "gtk")
+        
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLIB_INCLUDE_DIR glib.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLIBCONFIG_INCLUDE_DIR glibconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GLIB_LIBRARY glib false true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GDK_INCLUDE_DIR gdk/gdk.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GDKCONFIG_INCLUDE_DIR gdkconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-x11 false true)
+        _GTK2_FIND_LIBRARY    (GTK2_GDK_LIBRARY gdk-win32 false true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GTK_INCLUDE_DIR gtk/gtk.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-x11 false true)
+        _GTK2_FIND_LIBRARY    (GTK2_GTK_LIBRARY gtk-win32 false true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_CAIRO_INCLUDE_DIR cairo.h)
+        _GTK2_FIND_LIBRARY    (GTK2_CAIRO_LIBRARY cairo false false)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_PANGO_INCLUDE_DIR pango/pango.h)
+        _GTK2_FIND_LIBRARY    (GTK2_PANGO_LIBRARY pango false true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_ATK_INCLUDE_DIR atk/atk.h)
+        _GTK2_FIND_LIBRARY    (GTK2_ATK_LIBRARY atk false true)
+
+        #elseif(_GTK2_component STREQUAL "gdk_pixbuf")
+        #_GTK2_FIND_INCLUDE_DIR(GTK2_GDKPIXBUF_INCLUDE_DIR gdk-pixbuf/gdk-pixbuf.h)
+        #_GTK2_FIND_LIBRARY    (GTK2_GDKPIXBUF_LIBRARY gdk_pixbuf false true)
+
+    elseif(_GTK2_component STREQUAL "gtkmm")
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLIBMM_INCLUDE_DIR glibmm.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLIBMMCONFIG_INCLUDE_DIR glibmmconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GLIBMM_LIBRARY glibmm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GDKMM_INCLUDE_DIR gdkmm.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GDKMMCONFIG_INCLUDE_DIR gdkmmconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GDKMM_LIBRARY gdkmm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GTKMM_INCLUDE_DIR gtkmm.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GTKMMCONFIG_INCLUDE_DIR gtkmmconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GTKMM_LIBRARY gtkmm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_CAIROMM_INCLUDE_DIR cairomm/cairomm.h)
+        _GTK2_FIND_LIBRARY    (GTK2_CAIROMM_LIBRARY cairomm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_PANGOMM_INCLUDE_DIR pangomm.h)
+        _GTK2_FIND_LIBRARY    (GTK2_PANGOMM_LIBRARY pangomm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_SIGC++_INCLUDE_DIR sigc++/sigc++.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_SIGC++CONFIG_INCLUDE_DIR sigc++config.h)
+        _GTK2_FIND_LIBRARY    (GTK2_SIGC++_LIBRARY sigc true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GIOMM_INCLUDE_DIR giomm.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GIOMMCONFIG_INCLUDE_DIR giommconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GIOMM_LIBRARY giomm true true)
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_ATKMM_INCLUDE_DIR atkmm.h)
+        _GTK2_FIND_LIBRARY    (GTK2_ATKMM_LIBRARY atkmm true true)
+
+    elseif(_GTK2_component STREQUAL "glade")
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLADE_INCLUDE_DIR glade/glade.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GLADE_LIBRARY glade false true)
+    
+    elseif(_GTK2_component STREQUAL "glademm")
+
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLADEMM_INCLUDE_DIR libglademm.h)
+        _GTK2_FIND_INCLUDE_DIR(GTK2_GLADEMMCONFIG_INCLUDE_DIR libglademmconfig.h)
+        _GTK2_FIND_LIBRARY    (GTK2_GLADEMM_LIBRARY glademm true true)
+
+    else()
+        message(FATAL_ERROR "Unknown GTK2 component ${_component}")
+    endif()
+endforeach()
+
+#
+# Solve for the GTK2 version if we haven't already
+#
+if(NOT GTK2_FIND_VERSION AND GTK2_GTK_INCLUDE_DIR)
+    _GTK2_GET_VERSION(GTK2_MAJOR_VERSION
+                      GTK2_MINOR_VERSION
+                      GTK2_PATCH_VERSION
+                      ${GTK2_GTK_INCLUDE_DIR}/gtk/gtkversion.h)
+    set(GTK2_VERSION ${GTK2_MAJOR_VERSION}.${GTK2_MINOR_VERSION}.${GTK2_PATCH_VERSION})
+endif()
+
+#
+# Try to enforce components
+#
+
+set(_GTK2_did_we_find_everything true)  # This gets set to GTK2_FOUND
+
+include(FindPackageHandleStandardArgs)
+
+foreach(_GTK2_component ${GTK2_FIND_COMPONENTS})
+    string(TOUPPER ${_GTK2_component} _COMPONENT_UPPER)
+
+    if(_GTK2_component STREQUAL "gtk")
+        FIND_PACKAGE_HANDLE_STANDARD_ARGS(GTK2_${_COMPONENT_UPPER} "Some or all of the gtk libraries were not found."
+            GTK2_GTK_LIBRARY
+            GTK2_GTK_INCLUDE_DIR
+
+            GTK2_GLIB_INCLUDE_DIR
+            GTK2_GLIBCONFIG_INCLUDE_DIR
+            GTK2_GLIB_LIBRARY
+
+            GTK2_GDK_INCLUDE_DIR
+            GTK2_GDKCONFIG_INCLUDE_DIR
+            GTK2_GDK_LIBRARY
+        )
+    elseif(_GTK2_component STREQUAL "gtkmm")
+        FIND_PACKAGE_HANDLE_STANDARD_ARGS(GTK2_${_COMPONENT_UPPER} "Some or all of the gtkmm libraries were not found."
+            GTK2_GTKMM_LIBRARY
+            GTK2_GTKMM_INCLUDE_DIR
+            GTK2_GTKMMCONFIG_INCLUDE_DIR
+
+            GTK2_GLIBMM_INCLUDE_DIR
+            GTK2_GLIBMMCONFIG_INCLUDE_DIR
+            GTK2_GLIBMM_LIBRARY
+
+            GTK2_GDKMM_INCLUDE_DIR
+            GTK2_GDKMMCONFIG_INCLUDE_DIR
+            GTK2_GDKMM_LIBRARY
+        )
+    elseif(_GTK2_component STREQUAL "glade")
+        FIND_PACKAGE_HANDLE_STANDARD_ARGS(GTK2_${_COMPONENT_UPPER} "The glade library was not found."
+            GTK2_GLADE_LIBRARY
+            GTK2_GLADE_INCLUDE_DIR
+        )
+    elseif(_GTK2_component STREQUAL "glademm")
+        FIND_PACKAGE_HANDLE_STANDARD_ARGS(GTK2_${_COMPONENT_UPPER} "The glademm library was not found."
+            GTK2_GLADEMM_LIBRARY
+            GTK2_GLADEMM_INCLUDE_DIR
+            GTK2_GLADEMMCONFIG_INCLUDE_DIR
+        )
+    endif()
+
+    if(NOT GTK2_${_COMPONENT_UPPER}_FOUND)
+        set(_GTK2_did_we_find_everything false)
+    endif()
+endforeach()
+
+if(_GTK2_did_we_find_everything AND NOT GTK2_VERSION_CHECK_FAILED)
+    set(GTK2_FOUND true)
+else()
+    # Unset our variables.
+    set(GTK2_FOUND false)
+    set(GTK2_VERSION)
+    set(GTK2_VERSION_MAJOR)
+    set(GTK2_VERSION_MINOR)
+    set(GTK2_VERSION_PATCH)
+    set(GTK2_INCLUDE_DIRS)
+    set(GTK2_LIBRARIES)
+endif()
+
+if(GTK2_INCLUDE_DIRS)
+   list(REMOVE_DUPLICATES GTK2_INCLUDE_DIRS)
+endif()
+