/usr/share/cmake-2.8/Modules/FindGTK.cmake is in cmake-data 2.8.12.2-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | # - try to find GTK (and glib) and GTKGLArea
#  GTK_INCLUDE_DIR   - Directories to include to use GTK
#  GTK_LIBRARIES     - Files to link against to use GTK
#  GTK_FOUND         - GTK was found
#  GTK_GL_FOUND      - GTK's GL features were found
#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
#
# 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.)
# don't even bother under WIN32
if(UNIX)
  find_path( GTK_gtk_INCLUDE_PATH NAMES gtk/gtk.h
    PATH_SUFFIXES gtk-1.2 gtk12
    PATHS
    /usr/openwin/share/include
    /usr/openwin/include
    /opt/gnome/include
  )
  # Some Linux distributions (e.g. Red Hat) have glibconfig.h
  # and glib.h in different directories, so we need to look
  # for both.
  #  - Atanas Georgiev <atanas@cs.columbia.edu>
  find_path( GTK_glibconfig_INCLUDE_PATH NAMES glibconfig.h
    PATHS
    /usr/openwin/share/include
    /usr/local/include/glib12
    /usr/lib/glib/include
    /usr/local/lib/glib/include
    /opt/gnome/include
    /opt/gnome/lib/glib/include
  )
  find_path( GTK_glib_INCLUDE_PATH NAMES glib.h
    PATH_SUFFIXES gtk-1.2 glib-1.2 glib12
    PATHS
    /usr/openwin/share/include
    /usr/lib/glib/include
    /opt/gnome/include
  )
  find_path( GTK_gtkgl_INCLUDE_PATH NAMES gtkgl/gtkglarea.h
    PATHS /usr/openwin/share/include
          /opt/gnome/include
  )
  find_library( GTK_gtkgl_LIBRARY gtkgl
    /usr/openwin/lib
    /opt/gnome/lib
  )
  #
  # The 12 suffix is thanks to the FreeBSD ports collection
  #
  find_library( GTK_gtk_LIBRARY
    NAMES  gtk gtk12
    PATHS /usr/openwin/lib
          /opt/gnome/lib
  )
  find_library( GTK_gdk_LIBRARY
    NAMES  gdk gdk12
    PATHS  /usr/openwin/lib
           /opt/gnome/lib
  )
  find_library( GTK_gmodule_LIBRARY
    NAMES  gmodule gmodule12
    PATHS  /usr/openwin/lib
           /opt/gnome/lib
  )
  find_library( GTK_glib_LIBRARY
    NAMES  glib glib12
    PATHS  /usr/openwin/lib
           /opt/gnome/lib
  )
  find_library( GTK_Xi_LIBRARY
    NAMES Xi
    PATHS /usr/openwin/lib
          /opt/gnome/lib
    )
  find_library( GTK_gthread_LIBRARY
    NAMES  gthread gthread12
    PATHS  /usr/openwin/lib
           /opt/gnome/lib
  )
  if(GTK_gtk_INCLUDE_PATH
     AND GTK_glibconfig_INCLUDE_PATH
     AND GTK_glib_INCLUDE_PATH
     AND GTK_gtk_LIBRARY
     AND GTK_glib_LIBRARY)
    # Assume that if gtk and glib were found, the other
    # supporting libraries have also been found.
    set( GTK_FOUND "YES" )
    set( GTK_INCLUDE_DIR  ${GTK_gtk_INCLUDE_PATH}
                           ${GTK_glibconfig_INCLUDE_PATH}
                           ${GTK_glib_INCLUDE_PATH} )
    set( GTK_LIBRARIES  ${GTK_gtk_LIBRARY}
                        ${GTK_gdk_LIBRARY}
                        ${GTK_glib_LIBRARY} )
    if(GTK_gmodule_LIBRARY)
      set(GTK_LIBRARIES ${GTK_LIBRARIES} ${GTK_gmodule_LIBRARY})
    endif()
    if(GTK_gthread_LIBRARY)
      set(GTK_LIBRARIES ${GTK_LIBRARIES} ${GTK_gthread_LIBRARY})
    endif()
    if(GTK_Xi_LIBRARY)
      set(GTK_LIBRARIES ${GTK_LIBRARIES} ${GTK_Xi_LIBRARY})
    endif()
    if(GTK_gtkgl_INCLUDE_PATH AND GTK_gtkgl_LIBRARY)
      set( GTK_GL_FOUND "YES" )
      set( GTK_INCLUDE_DIR  ${GTK_INCLUDE_DIR}
                            ${GTK_gtkgl_INCLUDE_PATH} )
      set( GTK_LIBRARIES  ${GTK_gtkgl_LIBRARY} ${GTK_LIBRARIES} )
      mark_as_advanced(
        GTK_gtkgl_LIBRARY
        GTK_gtkgl_INCLUDE_PATH
        )
    endif()
  endif()
  mark_as_advanced(
    GTK_gdk_LIBRARY
    GTK_glib_INCLUDE_PATH
    GTK_glib_LIBRARY
    GTK_glibconfig_INCLUDE_PATH
    GTK_gmodule_LIBRARY
    GTK_gthread_LIBRARY
    GTK_Xi_LIBRARY
    GTK_gtk_INCLUDE_PATH
    GTK_gtk_LIBRARY
    GTK_gtkgl_INCLUDE_PATH
    GTK_gtkgl_LIBRARY
  )
endif()
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