diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c88d3aa75..35877d5d56 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -139,18 +139,23 @@ endif()
 
 include(CheckLib)
 
-include(FindOpenGL REQUIRED)
+include(FindOpenGL)
 include_directories(${OPENGL_INCLUDE_DIR})
 if(NOT OPENGL_GLU_FOUND)
 	message(FATAL_ERROR "GLU is required but not found")
 endif()
 
-include(FindOpenMP)
-if(OPENMP_FOUND)
-	add_definitions("${OpenMP_CXX_FLAGS}")
-	set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_CXX_FLAGS}")
-else()
-	message(FATAL_ERROR "OpenMP is required but not found")
+option(OPENMP "Enable OpenMP parallelization" ON)
+if(OPENMP)
+	include(FindOpenMP OPTIONAL)
+	if(OPENMP_FOUND)
+		message("OpenMP parallelization enabled")
+		add_definitions("${OpenMP_CXX_FLAGS}")
+		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_CXX_FLAGS}")
+	endif()
+endif()
+if(NOT OPENMP_FOUND)
+	message("OpenMP parallelization disabled")
 endif()
 
 include(FindALSA OPTIONAL)
@@ -381,7 +386,7 @@ if(NOT DISABLE_WX)
 					VERSION_EQUAL 2.8.2)
 				check_lib(GTK2 gtk+-2.0 gtk.h REQUIRED)
 			else()
-				include(FindGTK2 REQUIRED)
+				include(FindGTK2)
 				if(GTK2_FOUND)
 					include_directories(${GTK2_INCLUDE_DIRS})
 				endif()