diff -up ./CMakeLists.txt.orig ./CMakeLists.txt
--- ./CMakeLists.txt.orig	2013-07-22 17:03:46.468151019 +0000
+++ ./CMakeLists.txt	2013-07-22 17:04:32.772078189 +0000
@@ -407,8 +407,8 @@ add_subdirectory ( doc )
 # pkg-config support
 set ( prefix "${CMAKE_INSTALL_PREFIX}" )
 set ( exec_prefix "\${prefix}" )
-set ( libdir "\${exec_prefix}/${LIB_INSTALL_DIR}${LIB_SUFFIX}" )
-set ( includedir "\${prefix}/${INCLUDE_INSTALL_DIR}" )
+set ( libdir "${LIB_INSTALL_DIR}${LIB_SUFFIX}" )
+set ( includedir "${INCLUDE_INSTALL_DIR}" )
 configure_file ( fluidsynth.pc.in
 	${CMAKE_BINARY_DIR}/fluidsynth.pc IMMEDIATE @ONLY )
 install ( FILES ${CMAKE_BINARY_DIR}/fluidsynth.pc