From 1f1593ff27bdf51c3e1c45b92cfb0ac931960298 Mon Sep 17 00:00:00 2001
From: Jonathan Ringer <jonringer117@gmail.com>
Date: Wed, 27 Oct 2021 16:40:10 -0700
Subject: Use GNUInstallDirs for mapping installation directories

---
 CMakeLists.txt                | 4 +++-
 cmake/AddEventLibrary.cmake   | 8 ++++----
 cmake/LibeventConfig.cmake.in | 8 +++-----
 cmake/UseDoxygen.cmake        | 4 ++--
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ce72bbd..7b6ad7e1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1621,8 +1621,10 @@ endif()
 # Installation preparation.
 #
 
+include(GNUInstallDirs)
+
 set(EVENT_INSTALL_CMAKE_DIR
-    "${CMAKE_INSTALL_PREFIX}/lib/cmake/libevent")
+    "${CMAKE_INSTALL_LIBDIR}/cmake/libevent")
 
 export(PACKAGE libevent)
 
diff --git a/cmake/AddEventLibrary.cmake b/cmake/AddEventLibrary.cmake
index 9af39441..3d53258c 100644
--- a/cmake/AddEventLibrary.cmake
+++ b/cmake/AddEventLibrary.cmake
@@ -13,8 +13,8 @@ endmacro()
 macro(generate_pkgconfig LIB_NAME)
     set(prefix      ${CMAKE_INSTALL_PREFIX})
     set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-    set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)
-    set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
+    set(libdir      ${CMAKE_INSTALL_LIBDIR})
+    set(includedir  ${CMAKE_INSTALL_INCLUDEDIR})
 
     set(VERSION ${EVENT_ABI_LIBVERSION})
 
@@ -31,7 +31,7 @@ macro(generate_pkgconfig LIB_NAME)
     configure_file("lib${LIB_NAME}.pc.in" "lib${LIB_NAME}.pc" @ONLY)
     install(
         FILES "${CMAKE_CURRENT_BINARY_DIR}/lib${LIB_NAME}.pc"
-        DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig"
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig"
     )
 endmacro()
 
@@ -151,7 +151,7 @@ macro(add_event_library LIB_NAME)
             set_target_properties(
                 "${LIB_NAME}_shared" PROPERTIES
                 OUTPUT_NAME "${LIB_NAME}-${EVENT_PACKAGE_RELEASE}.${CURRENT_MINUS_AGE}"
-                INSTALL_NAME_DIR "${CMAKE_INSTALL_PREFIX}/lib"
+                INSTALL_NAME_DIR "${CMAKE_INSTALL_LIBDIR}"
                 LINK_FLAGS "-compatibility_version ${COMPATIBILITY_VERSION} -current_version ${COMPATIBILITY_VERSION}.${EVENT_ABI_LIBVERSION_REVISION}")
         else()
             math(EXPR CURRENT_MINUS_AGE "${EVENT_ABI_LIBVERSION_CURRENT}-${EVENT_ABI_LIBVERSION_AGE}")
diff --git a/cmake/LibeventConfig.cmake.in b/cmake/LibeventConfig.cmake.in
index a12fc23c..582739fa 100644
--- a/cmake/LibeventConfig.cmake.in
+++ b/cmake/LibeventConfig.cmake.in
@@ -58,7 +58,6 @@ endif()
 
 # Get the path of the current file.
 get_filename_component(LIBEVENT_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
-get_filename_component(_INSTALL_PREFIX "${LIBEVENT_CMAKE_DIR}/../../.." ABSOLUTE)
 
 macro(message_if_needed _flag _msg)
     if (NOT ${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
@@ -116,7 +115,7 @@ if(CONFIG_FOR_INSTALL_TREE)
     unset(_event_h CACHE)
     find_path(_event_h
               NAMES event2/event.h
-              PATHS "${_INSTALL_PREFIX}/include"
+              PATHS "@CMAKE_INSTALL_INCLUDEDIR@"
               NO_DEFAULT_PATH)
     if(_event_h)
         set(LIBEVENT_INCLUDE_DIRS "${_event_h}")
@@ -135,7 +134,7 @@ if(CONFIG_FOR_INSTALL_TREE)
                     NO_DEFAULT_PATH)
         find_library(_event_lib_rel
                     NAMES "event_${_comp}"
-                    PATHS "${_INSTALL_PREFIX}/lib"
+                    PATHS "@CMAKE_INSTALL_LIBDIR@"
                     NO_DEFAULT_PATH)
         if(_event_lib_rel OR _event_lib_dbg)
             list(APPEND LIBEVENT_LIBRARIES "libevent::${_comp}")
@@ -167,7 +166,7 @@ set(LIBEVENT_INCLUDE_DIR ${LIBEVENT_INCLUDE_DIRS})
 if(LIBEVENT_LIBRARIES)
     set(LIBEVENT_LIBRARY ${LIBEVENT_LIBRARIES})
     if(CONFIG_FOR_INSTALL_TREE)
-        message_if_needed(STATUS "Found libevent ${LIBEVENT_VERSION} in ${_INSTALL_PREFIX}")
+        message_if_needed(STATUS "Found libevent ${LIBEVENT_VERSION} in @CMAKE_INSTALL_LIBDIR@")
     else()
         message_if_needed(STATUS "Found libevent ${LIBEVENT_VERSION} in ${LIBEVENT_CMAKE_DIR}")
     endif()
@@ -190,4 +189,3 @@ unset(_LIB_TYPE)
 unset(_AVAILABLE_LIBS)
 unset(_EVENT_COMPONENTS)
 unset(_POSSIBLE_PKG_NAMES)
-unset(_INSTALL_PREFIX)
diff --git a/cmake/UseDoxygen.cmake b/cmake/UseDoxygen.cmake
index c7e4b175..292aaaa4 100644
--- a/cmake/UseDoxygen.cmake
+++ b/cmake/UseDoxygen.cmake
@@ -90,7 +90,7 @@ macro(UseDoxygen)
       if ("${DOXYGEN_GENERATE_HTML}" STREQUAL "YES")
         install(DIRECTORY
           ${PROJECT_BINARY_DIR}/${DOXYGEN_OUTPUT_DIRECTORY}/html
-          DESTINATION ${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME}
+          DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/doc/${PROJECT_NAME}
           COMPONENT doc
         )
       endif()
@@ -106,7 +106,7 @@ macro(UseDoxygen)
         # Install manual into <prefix>/share/man/man3
         install(DIRECTORY
           ${MAN_PAGES_DIR}
-          DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man
+          DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/man
           COMPONENT doc
         )
       endif()
-- 
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