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+#[[.rst
+#
+# FindGuile
+# ---------
+# Find the development libraries for Guile.
+#
+# Exported Vars
+# ~~~~~~~~~~~~~
+#
+# .. variable:: Guile_FOUND
+#
+#    Set to *true* if Guile was found.
+#
+# .. variable:: Guile_INCLUDE_DIRS
+#
+#    A list of include directories.
+#
+# .. variable:: Guile_LIBRARIES
+#
+#    A list of libraries needed to build you project.
+#
+# .. variable:: Guile_VERSION_STRING
+#
+#    Guile full version.
+#
+# .. variable:: Guile_VERSION_MAJOR
+#
+#    Guile major version.
+#
+# .. variable:: Guile_VERSION_MINOR
+#
+#    Guile minor version.
+#
+# .. variable:: Guile_VERSION_PATCH
+#
+#    Guile patch version.
+#
+# .. variable:: Guile_EXECUTABLE
+#
+#    Guile executable (optional).
+#
+# .. variable:: Guile_CONFIG_EXECUTABLE
+#
+#    Guile configuration executable (optional).
+#
+# .. variable:: Guile_ROOT_DIR
+#
+#    Guile installation root dir (optional).
+#
+# .. variable:: Guile_SITE_DIR
+#
+#    Guile installation module site dir (optional).
+#
+# .. variable:: Guile_EXTENSION_DIR
+#
+#    Guile installation extension dir (optional).
+#
+# Control VARS
+# ~~~~~~~~~~~~
+# :envvar:`Guile_ROOT_DIR`
+#
+#   Use this variable to provide hints to :filename:`find_{*}` commands,
+#   you may pass it to :command:`cmake` or set the environtment variable.
+#
+# .. code-block:: cmake
+#
+#    % cmake . -Bbuild -DGuile_ROOT_DIR=<extra-path>
+#
+#    # or
+#    % export Guile_ROOT_DIR=<extra-path>;
+#    % cmake . -Bbuild
+#
+#    # or
+#    % Guile_ROOT_DIR=<extra-path> cmake . -Bbuild
+#
+#
+#]]
+
+
+#[[.rst
+#
+# Copyright © 2016, Edelcides Gonçalves <eatg75 |0x40| gmail>
+#
+# Permission to use, copy, modify, and/or distribute this software for
+# any purpose with or without fee is hereby granted, provided that the
+# above copyright notice and this permission notice appear in all
+# copies.
+#
+# *THE SOFTWARE IS PROVIDED* **AS IS** *AND ISC DISCLAIMS ALL
+# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE
+# LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+# PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+# TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+# PERFORMANCE OF THIS SOFTWARE*.
+#
+# This file is not part of CMake
+#
+#]]
+
+
+include (SelectLibraryConfigurations)
+include (FindPackageHandleStandardArgs)
+
+function (_guile_find_component_include_dir component header)
+  find_path ("${component}_INCLUDE_DIR"
+    ${header}
+    HINTS
+    "${GUile_ROOT_DIR}"
+    ENV Guile_ROOT_DIR
+    PATH_SUFFIXES
+    Guile guile Guile-2.0 guile-2.0 Guile/2.0 guile/2.0 GC
+    gc)
+
+  set ("${component}_INCLUDE_DIR" "${${component}_INCLUDE_DIR}"
+    PARENT_SCOPE)
+endfunction ()
+
+function (_guile_find_component_library component_name component)
+
+  find_library ("${component_name}_LIBRARY_RELEASE"
+    NAMES "${component}" "${component}-2.0"
+    HINTS
+    "${GUile_ROOT_DIR}"
+    ENV Guile_ROOT_DIR
+    PATHS
+    /usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}
+    /usr/lib64/${CMAKE_LIBRARY_ARCHITECTURE}
+    /usr/lib32/${CMAKE_LIBRARY_ARCHITECTURE})
+
+  if  (${component_name}_LIBRARY_RELEASE)
+    select_library_configurations (${component_name})
+    set ("${component_name}_LIBRARY_RELEASE"
+      "${${component_name}_LIBRARY_RELEASE}" PARENT_SCOPE)
+    set ("${component_name}_LIBRARY"
+      "${${component_name}_LIBRARY}" PARENT_SCOPE)
+    set ("${component_name}_LIBRARIES"
+      "${${component_name}_LIBRARIES}" PARENT_SCOPE)
+  endif ()
+endfunction ()
+
+function (_guile_find_version_2 header_file macro_name)
+  file (STRINGS "${header_file}" _VERSION
+    REGEX "#define[\t ]+${macro_name}[\t ]+[0-9]+")
+
+  if (_VERSION)
+    string (REGEX REPLACE
+      ".*#define[\t ]+${macro_name}[\t ]+([0-9]+).*"
+      "\\1" _VERSION_VALUE "${_VERSION}")
+    if ("${_VERSION}" STREQUAL "${_VERSION_VALUE}")
+      set (_VERSION_FOUND 0 PARENT_SCOPE)
+    else ()
+      set (_VERSION_FOUND 1 PARENT_SCOPE)
+      set (_VERSION "${_VERSION_VALUE}" PARENT_SCOPE)
+    endif ()
+  else ()
+    set (_VERSION_FOUND 0 PARENT_SCOPE)
+  endif ()
+endfunction ()
+
+
+##### Entry Point #####
+
+set (Guile_FOUND)
+set (Guile_INCLUDE_DIRS)
+set (Guile_LIBRARIES)
+set (Guile_VERSION_STRING)
+set (Guile_VERSION_MAJOR)
+set (Guile_VERSION_MINOR)
+set (Guile_VERSION_PATCH)
+set (Guile_EXECUTABLE)
+
+_guile_find_component_include_dir (Guile "libguile.h")
+if (Guile_INCLUDE_DIR)
+  _guile_find_version_2 ("${Guile_INCLUDE_DIR}/libguile/version.h"
+    SCM_MAJOR_VERSION)
+  if (_VERSION_FOUND)
+    set (Guile_VERSION_MAJOR "${_VERSION}")
+  else ()
+    message (FATAL_ERROR "FindGuile: Failed to find Guile_MAJOR_VERSION.")
+  endif ()
+
+  _guile_find_version_2 ("${Guile_INCLUDE_DIR}/libguile/version.h"
+    SCM_MINOR_VERSION)
+  if (_VERSION_FOUND)
+    set (Guile_VERSION_MINOR "${_VERSION}")
+  else ()
+    message (FATAL_ERROR "FindGuile: Failed to find Guile_MINOR_VERSION.")
+  endif ()
+
+  _guile_find_version_2 ("${Guile_INCLUDE_DIR}/libguile/version.h"
+    SCM_MICRO_VERSION)
+  if (_VERSION_FOUND)
+    set (Guile_VERSION_PATCH "${_VERSION}")
+  else ()
+    message (FATAL_ERROR "FindGuile: Failed to find Guile_MICRO_VERSION.")
+  endif ()
+  set (Guile_VERSION_STRING "${Guile_VERSION_MAJOR}.${Guile_VERSION_MINOR}.${Guile_VERSION_PATCH}")
+
+  unset (_VERSION_FOUND)
+  unset (_VERSION)
+endif ()
+
+_guile_find_component_include_dir (Guile_GC "gc.h")
+_guile_find_component_library (Guile guile)
+_guile_find_component_library (Guile_GC gc)
+
+find_program (Guile_EXECUTABLE
+  guile
+  DOC "Guile executable.")
+
+if (Guile_EXECUTABLE)
+  execute_process (COMMAND ${Guile_EXECUTABLE} --version
+    RESULT_VARIABLE _status
+    OUTPUT_VARIABLE _output
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  string (REGEX REPLACE ".*\\(GNU Guile\\)[\t ]+([0-9]+)\\..*" "\\1"
+    _guile_ver_major "${_output}")
+
+  string (REGEX REPLACE ".*\\(GNU Guile\\)[\t ]+[0-9]+\\.([0-9]+).*" "\\1"
+    _guile_ver_minor "${_output}")
+
+  string (REGEX REPLACE ".*\\(GNU Guile\\)[\t ]+[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1"
+    _guile_ver_patch "${_output}")
+
+  set (_version "${_guile_ver_major}.${_guile_ver_minor}.${_guile_ver_patch}")
+
+  if (NOT Guile_FIND_QUIETLY)
+    if (NOT Guile_VERSION_STRING STREQUAL _version)
+      message (WARNING "FindGuile: Versions provided by library differs from the one provided by executable.")
+    endif ()
+
+    if (NOT _status STREQUAL "0")
+      message (WARNING "FindGuile: guile (1) process exited abnormally.")
+    endif ()
+  endif ()
+
+  unset (_version)
+  unset (_status)
+  unset (_version)
+  unset (_guile_ver_major)
+  unset (_guile_ver_minor)
+  unset (_guile_ver_patch)
+endif ()
+
+find_package_handle_standard_args (GC
+  "FindGuile: Failed to find dependency GC."
+  Guile_GC_INCLUDE_DIR
+  Guile_GC_LIBRARY
+  Guile_GC_LIBRARIES
+  Guile_GC_LIBRARY_RELEASE)
+
+find_package_handle_standard_args (Guile
+  REQUIRED_VARS
+  Guile_INCLUDE_DIR
+  Guile_LIBRARY
+  Guile_LIBRARIES
+  Guile_LIBRARY_RELEASE
+  GC_FOUND
+  VERSION_VAR Guile_VERSION_STRING)
+
+if (Guile_FOUND)
+  list (APPEND Guile_INCLUDE_DIRS "${Guile_INCLUDE_DIR}"
+    "${Guile_GC_INCLUDE_DIR}")
+
+  if (NOT TARGET Guile::Library AND NOT TARGET GC::Library)
+    add_library (Guile::GC::Library UNKNOWN IMPORTED)
+    set_property (TARGET Guile::GC::Library APPEND
+      PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+
+    set_target_properties (Guile::GC::Library
+      PROPERTIES
+      INTERFACE_INCLUDE_DIRS
+      "${Guile_GC_INCLUDE_DIR}"
+      IMPORTED_LOCATION
+      "${Guile_GC_LIBRARY}"
+      IMPORTED_LOCATION_RELEASE
+      "${Guile_GC_LIBRARY_RELEASE}")
+
+    add_library (Guile::Library UNKNOWN IMPORTED)
+    set_property (TARGET Guile::Library APPEND
+      PROPERTY IMPORTED_CONFIGURATIONS RELEASE)
+    set_property (TARGET Guile::Library APPEND
+      PROPERTY
+      INTERFACE_LINK_LIBRARIES
+      Guile::GC::Library)
+
+    set_target_properties (Guile::Library
+      PROPERTIES
+      INTERFACE_INCLUDE_DIRSr
+      "${Guile_INCLUDE_DIR}"
+      IMPORTED_LOCATION "${Guile_LIBRARY}"
+      IMPORTED_LOCATION_RELEASE
+      "${Guile_LIBRARY_RELEASE}")
+
+    set (Guile_LIBRARIES Guile::Library Guile::GC::Library)
+  endif ()
+endif ()
+
+find_program(Guile_CONFIG_EXECUTABLE
+  NAMES guile-config
+  DOC "Guile configutration binary")
+
+if (Guile_CONFIG_EXECUTABLE)
+  execute_process (COMMAND ${Guile_CONFIG_EXECUTABLE} info prefix
+    OUTPUT_VARIABLE Guile_ROOT_DIR
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  execute_process (COMMAND ${Guile_CONFIG_EXECUTABLE} info sitedir
+    OUTPUT_VARIABLE Guile_SITE_DIR
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+  execute_process (COMMAND ${Guile_CONFIG_EXECUTABLE} info extensiondir
+    OUTPUT_VARIABLE Guile_EXTENSION_DIR
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif ()
+
+mark_as_advanced (Guile_EXECUTABLE
+  Guile_INCLUDE_DIR
+  Guile_LIBRARY
+  Guile_LIBRARY_RELEASE
+  Guile_GC_INCLUDE_DIR
+  Guile_GC_LIBRARY
+  Guile_GC_LIBRARY_RELEASE)