diff -Nru lmms-0.4.2.orig/CMakeLists.txt lmms-0.4.2/CMakeLists.txt
--- lmms-0.4.2.orig/CMakeLists.txt	2008-12-19 17:44:15.000000000 +0100
+++ lmms-0.4.2/CMakeLists.txt	2009-02-04 17:11:07.000000000 +0100
@@ -415,7 +415,7 @@
 #
 # build LMMS-binary
 #
-ADD_DEFINITIONS(-D'LIB_DIR="${CMAKE_INSTALL_PREFIX}/${LIB_DIR}/"' -D'PLUGIN_DIR="${CMAKE_INSTALL_PREFIX}/${LIB_DIR}/lmms/"' ${PULSEAUDIO_DEFINITIONS} ${PORTAUDIO_DEFINITIONS})
+ADD_DEFINITIONS(-D'LIB_DIR="${CMAKE_INSTALL_PREFIX}/${LIB_DIR}/"' -D'PLUGIN_DIR="${CMAKE_INSTALL_LIBDIR}/lmms/"' ${PULSEAUDIO_DEFINITIONS} ${PORTAUDIO_DEFINITIONS})
 
 INCLUDE_DIRECTORIES(${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}/include ${CMAKE_SOURCE_DIR} ${CMAKE_SOURCE_DIR}/include ${SDL_INCLUDE_DIR} ${PORTAUDIO_INCLUDE_DIR} ${PULSEAUDIO_INCLUDE_DIR} ${JACK_INCLUDE_DIRS} ${OGGVORBIS_INCLUDE_DIR} ${SAMPLERATE_INCLUDE_DIRS} ${SNDFILE_INCLUDE_DIRS})
 LINK_DIRECTORIES(${CMAKE_INSTALL_PREFIX}/lib ${ASOUND_LIBRARY_DIR} ${JACK_LIBRARY_DIRS} ${SAMPLERATE_LIBRARY_DIRS} ${SNDFILE_LIBRARY_DIRS})