Do not use CMAKE_THREAD_LIBS_INIT as linker flag
Don't pick up libdispatch if available.

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -5,7 +5,6 @@ project(libobjc)
 enable_language(ASM)
 
 set(CMAKE_C_FLAGS_DEBUG "-g -O0 -fno-inline ${CMAKE_C_FLAGS_DEBUG}")
-set(CMAKE_C_FLAGS_RELEASE "-O3 ${CMAKE_C_FLAGS_RELEASE}")
 set(CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
 
 set(libobjc_VERSION 4.6)
@@ -237,12 +236,8 @@ endif (ENABLE_OBJCXX)
 
 # Currently, we actually need pthreads, but we should use the platform's native
 # threading implementation (we do for everything except thread-local storage)
-set(CMAKE_THREAD_PREFER_PTHREAD)
-include(FindThreads)
-set(objc_LINK_FLAGS "${objc_LINK_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
+find_package(Threads REQUIRED)
 
-
-
 add_library(objc SHARED ${libobjc_C_SRCS} ${libobjc_ASM_SRCS} ${libobjc_OBJC_SRCS} ${libobjc_CXX_SRCS})
 
 set_target_properties(objc PROPERTIES
@@ -265,6 +260,9 @@ if (BUILD_STATIC_LIBOBJC)
 endif ()
 
 
+if (CMAKE_THREAD_LIBS_INIT)
+	target_link_libraries(objc ${CMAKE_THREAD_LIBS_INIT})
+endif ()
 
 # Explicitly link the C++ runtime and libgc if we are compiling with gc support.
 target_link_libraries(objc ${CXX_RUNTIME})
@@ -272,12 +270,6 @@ if (LIBGC)
 	target_link_libraries(objc ${LIBGC})
 endif ()
 
-# Link libdispatch if available (we'll miss symbols for toydispatch otherwise)
-find_library(LIBDISPATCH dispatch)
-if (LIBDISPATCH)
-	target_link_libraries(objc ${LIBDISPATCH})
-endif ()
-
 # Make weak symbols work on OS X
 if (APPLE)
 	set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS
@@ -285,6 +277,11 @@ if (APPLE)
 	set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -Wl,-undefined,dynamic_lookup")
 	set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} -Wl,-undefined,dynamic_lookup")
 endif ()
+
+if (NOT CMAKE_INSTALL_LIBDIR)
+	set(CMAKE_INSTALL_LIBDIR lib)
+endif ()
+
 
 #
 # Installation