From a48c4e6b0b28a48e8ea7df983578e8e9f0d67a3a Mon Sep 17 00:00:00 2001
From: Kentaro Hayashi <hayashi@clear-code.com>
Date: Sat, 17 Oct 2020 17:41:05 +0900
Subject: cmake: use GNUInstallDirs.cmake on UNIX

It enables to support Multiarch path (/usr/lib/<triplet>) well.
---
 CMakeLists.txt | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9124f9e..c3a8b99 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,10 +30,18 @@ option(SPM_USE_BUILTIN_PROTOBUF "Use built-in protobuf" ON)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-set(prefix ${CMAKE_INSTALL_PREFIX})
-set(exec_prefix "\${prefix}")
-set(libdir "\${exec_prefix}/lib")
-set(includedir "\${prefix}/include")
+if (UNIX)
+  include(GNUInstallDirs)
+  set(prefix ${CMAKE_INSTALL_PREFIX})
+  set(exec_prefix "\${prefix}")
+  set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+  set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+  set(prefix ${CMAKE_INSTALL_PREFIX})
+  set(exec_prefix "\${prefix}")
+  set(libdir "\${exec_prefix}/lib")
+  set(includedir "\${prefix}/include")
+endif()
 set(GNUCXX_STD_SUPPORT_VERSION "4.3")
 
 if (SPM_USE_BUILTIN_PROTOBUF)
-- 
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