--- CMakeLists.txt~ 2013-04-25 20:24:44.000000000 +0800 +++ CMakeLists.txt 2013-06-02 20:10:01.495264785 +0800 @@ -256,7 +256,7 @@ if(NOT WIN32 OR CYGWIN OR MINGW) set(prefix ${CMAKE_INSTALL_PREFIX}) set(exec_prefix ${CMAKE_INSTALL_PREFIX}) - set(libdir ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}) + set(libdir ${CMAKE_INSTALL_LIBDIR}) set(includedir ${CMAKE_INSTALL_PREFIX}/include) set(LIBS "-lz -lm") configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in