gentoo-overlay/dev-games/ois/files/ois-1.5-libdir.patch

https://github.com/wgois/OIS/commit/0536741549a157627d4306f6e19f1cc5cb52cef8
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -229,7 +229,13 @@ if (OIS_BUILD_DEMOS)
 
 endif()
 
-set(LIB_INSTALL_DIR "lib")
+if(UNIX)
+	include(GNUInstallDirs)
+	set(LIB_INSTALL_DIR ${CMAKE_INSTALL_LIBDIR})
+else()
+	set(LIB_INSTALL_DIR "lib")
+endif()
+
 set(OIS_LIB_DIRECTORY ${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR})
 
 file(GLOB PUBLIC_HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/includes/*.h")
@@ -240,8 +246,8 @@ install(FILES ${PUBLIC_HEADERS}
 
 install(TARGETS OIS
   RUNTIME DESTINATION bin
-  LIBRARY DESTINATION lib
-  ARCHIVE DESTINATION lib
+  LIBRARY DESTINATION ${LIB_INSTALL_DIR}
+  ARCHIVE DESTINATION ${LIB_INSTALL_DIR}
   FRAMEWORK DESTINATION Library/Frameworks
 )