diff --git a/Demos3/AllBullet2Demos/CMakeLists.txt b/Demos3/AllBullet2Demos/CMakeLists.txt
index 0d16efb3d..6023d44c6 100644
--- a/Demos3/AllBullet2Demos/CMakeLists.txt
+++ b/Demos3/AllBullet2Demos/CMakeLists.txt
@@ -50,7 +50,7 @@ ELSE(WIN32)
                 MESSAGE(${COCOA})
                 link_libraries(${COCOA})
         ELSE(APPLE)
-		LINK_LIBRARIES( GLEW)
+		LINK_LIBRARIES( pthread GLEW)
 	ENDIF(APPLE)
 ENDIF(WIN32)
  
diff --git a/Demos3/GpuDemos/CMakeLists.txt b/Demos3/GpuDemos/CMakeLists.txt
index 06dc4e81a..b6fadf82e 100644
--- a/Demos3/GpuDemos/CMakeLists.txt
+++ b/Demos3/GpuDemos/CMakeLists.txt
@@ -50,7 +50,7 @@ ELSE(WIN32)
                 MESSAGE(${COCOA})
                 link_libraries(${COCOA})
         ELSE(APPLE)
-		LINK_LIBRARIES( GLEW X11 dl)
+		LINK_LIBRARIES( GLEW X11 pthread dl)
 	ENDIF(APPLE)
 ENDIF(WIN32)
 
diff --git a/Demos3/SimpleOpenGL3/CMakeLists.txt b/Demos3/SimpleOpenGL3/CMakeLists.txt
index 14f604717..417cef45a 100644
--- a/Demos3/SimpleOpenGL3/CMakeLists.txt
+++ b/Demos3/SimpleOpenGL3/CMakeLists.txt
@@ -27,7 +27,7 @@ ELSE(WIN32)
 		MESSAGE(${COCOA})
 		link_libraries(${COCOA})
 	ELSE(APPLE)
-		LINK_LIBRARIES( GLEW X11 dl Xext)
+		LINK_LIBRARIES( GLEW X11 pthread dl Xext)
 	ENDIF(APPLE)
 ENDIF(WIN32)