From fff2c4141e33ab3edf4d7b7ba31c68f12c91c1c4 Mon Sep 17 00:00:00 2001
From: abma <spring@abma.de>
Date: Wed, 2 Sep 2015 09:56:58 +0200
Subject: [PATCH] fix #634

---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1a13ef6f..166791a04 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,7 +63,9 @@ if( CMAKE_COMPILER_IS_MINGW )
 endif()
 
 if((CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX) AND NOT CMAKE_COMPILER_IS_MINGW)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC") # this is a very important switch and some libraries seem now to have it....
+  if (BUILD_SHARED_LIBS AND CMAKE_SIZEOF_VOID_P EQUAL 8) # -fPIC is only required for shared libs on 64 bit
+     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+  endif()
   # hide all not-exported symbols
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -Wall" )
 elseif(MSVC)