From 56bf091a0e8c5242e160d37f2974f3e1e2525821 Mon Sep 17 00:00:00 2001
From: David Seifert <soap@gentoo.org>
Date: Sun, 7 May 2017 10:49:21 +0200
Subject: [PATCH] Use GNUInstallDirs in order to change installation paths

* This allows distro-specific modification of directories
  to adjust to different FHS layouts.
---
 CMakeLists.txt                 | 5 ++++-
 docs/CMakeLists.txt            | 2 +-
 resources/music/CMakeLists.txt | 2 +-
 src/tracker/CMakeLists.txt     | 2 +-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 996e2f0..bac54f3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,9 +19,12 @@
 #  along with MilkyTracker.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.5)
 project(MilkyTracker)
 
+# Adhere to GNU filesystem layout conventions
+include(GNUInstallDirs)
+
 # Force SDL if requested
 option(FORCESDL "Force SDL instead of native" OFF)
 if(FORCESDL)
diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
index 0aacc60..aca4a61 100644
--- a/docs/CMakeLists.txt
+++ b/docs/CMakeLists.txt
@@ -35,7 +35,7 @@ elseif(WIN32)
     set(INSTALL_DEST .)
 else()
     list(APPEND DOCUMENTS readme_unix)
-    set(INSTALL_DEST share/doc/${PROJECT_NAME_LOWER})
+    set(INSTALL_DEST ${CMAKE_INSTALL_DOCDIR})
 endif()
 
 install(FILES ${DOCUMENTS} DESTINATION ${INSTALL_DEST})
diff --git a/resources/music/CMakeLists.txt b/resources/music/CMakeLists.txt
index f918b6e..f29fcd6 100644
--- a/resources/music/CMakeLists.txt
+++ b/resources/music/CMakeLists.txt
@@ -24,7 +24,7 @@ file(GLOB SONGS "*.xm")
 if(APPLE OR WIN32)
     set(INSTALL_DEST "Example Songs")
 else()
-    set(INSTALL_DEST share/${PROJECT_NAME_LOWER}/songs)
+    set(INSTALL_DEST ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME_LOWER}/songs)
 endif()
 
 install(FILES ${SONGS} DESTINATION ${INSTALL_DEST})
diff --git a/src/tracker/CMakeLists.txt b/src/tracker/CMakeLists.txt
index 1e4062e..b7a96a7 100644
--- a/src/tracker/CMakeLists.txt
+++ b/src/tracker/CMakeLists.txt
@@ -399,7 +399,7 @@ target_link_libraries(
 if(APPLE OR WIN32)
     set(INSTALL_DEST .)
 else()
-    set(INSTALL_DEST bin)
+    set(INSTALL_DEST ${CMAKE_INSTALL_BINDIR})
 endif()
 
 install(TARGETS ${TARGET_NAME} DESTINATION ${INSTALL_DEST})