diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22bc0e7cc..0858ecab5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,39 @@
 cmake_minimum_required( VERSION 2.4 )
 project(ZDoom)
 
+# Generator expression are available some time in CMake 2.8. Due to
+# cmake_minimum_required, we can assume a minor version of > 7 implies major >= 2
+if(${CMAKE_MAJOR_VERSION} GREATER 2 OR ${CMAKE_MINOR_VERSION} GREATER 7)
+	option( NO_GENERATOR_EXPRESSIONS "Disable generator expressions (for building pk3s with IDEs)." OFF )
+else(${CMAKE_MAJOR_VERSION} GREATER 2 OR ${CMAKE_MINOR_VERSION} GREATER 7)
+	set( NO_GENERATOR_EXPRESSIONS ON )
+endif(${CMAKE_MAJOR_VERSION} GREATER 2 OR ${CMAKE_MINOR_VERSION} GREATER 7)
+
+# Simplify pk3 building, add_pk3(filename srcdirectory)
+function( add_pk3 PK3_NAME PK3_DIR )
+	get_target_property(ZIPDIR_EXE zipdir LOCATION)
+
+	# Generate target name. Just use "pk3" for main pk3 target.
+	string( REPLACE "." "_" PK3_TARGET ${PK3_NAME} )
+	if( ${PK3_TARGET} STREQUAL "zdoom_pk3" )
+		set( PK3_TARGET "pk3" )
+	endif( ${PK3_TARGET} STREQUAL "zdoom_pk3" )
+
+	if( NO_GENERATOR_EXPRESSIONS )
+		add_custom_command( OUTPUT ${ZDOOM_OUTPUT_DIR}/${PK3_NAME}
+			COMMAND ${ZIPDIR_EXE} -udf ${ZDOOM_OUTPUT_DIR}/${PK3_NAME} ${PK3_DIR}
+			COMMAND ${CMAKE_COMMAND} -E copy_if_different ${ZDOOM_OUTPUT_DIR}/${PK3_NAME} $<TARGET_FILE_DIR:zdoom>
+			DEPENDS zipdir ${PK3_DIR} )
+	else( NO_GENERATOR_EXPRESSIONS )
+		add_custom_command( OUTPUT ${ZDOOM_OUTPUT_DIR}/${PK3_NAME}
+			COMMAND ${ZIPDIR_EXE} -udf ${ZDOOM_OUTPUT_DIR}/${PK3_NAME} ${PK3_DIR}
+			DEPENDS zipdir ${PK3_DIR} )
+	endif( NO_GENERATOR_EXPRESSIONS )
+
+	add_custom_target( ${PK3_TARGET} ALL
+		DEPENDS ${ZDOOM_OUTPUT_DIR}/${PK3_NAME} )
+endfunction( add_pk3 )
+
 IF( NOT CMAKE_BUILD_TYPE )
 	SET( CMAKE_BUILD_TYPE Debug CACHE STRING
 		"Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a8abc70c8..82f347fd8 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,7 +9,12 @@ include( CheckFunctionExists )
 include( CheckCXXCompilerFlag )
 include( FindPkgConfig )
 
-option( NO_ASM "Disable assembly code" )
+if( NOT APPLE )
+	option( NO_ASM "Disable assembly code" OFF )
+else( NOT APPLE )
+	# At the moment asm code doesn't work with OS X, so disable by default
+	option( NO_ASM "Disable assembly code" ON )
+endif( NOT APPLE )
 if( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" )
 	option( NO_STRIP "Do not strip Release or MinSizeRel builds" )
 	# At least some versions of Xcode fail if you strip with the linker
diff --git a/wadsrc/CMakeLists.txt b/wadsrc/CMakeLists.txt
index 422052511..83dc8292d 100644
--- a/wadsrc/CMakeLists.txt
+++ b/wadsrc/CMakeLists.txt
@@ -1,11 +1,3 @@
 cmake_minimum_required( VERSION 2.4 )
 
-get_target_property(ZIPDIR_EXE zipdir LOCATION)
-
-add_custom_command( OUTPUT ${ZDOOM_OUTPUT_DIR}/zdoom.pk3
-	COMMAND ${ZIPDIR_EXE} -udf ${ZDOOM_OUTPUT_DIR}/zdoom.pk3 ${CMAKE_CURRENT_SOURCE_DIR}/static 
-	COMMAND ${CMAKE_COMMAND} -E copy_if_different ${ZDOOM_OUTPUT_DIR}/zdoom.pk3 $<TARGET_FILE_DIR:zdoom>
-	DEPENDS zipdir ${CMAKE_CURRENT_SOURCE_DIR}/static )
-
-add_custom_target( pk3 ALL
-	DEPENDS ${ZDOOM_OUTPUT_DIR}/zdoom.pk3 )
+add_pk3(zdoom.pk3 ${CMAKE_CURRENT_SOURCE_DIR}/static)