Fix hard-coded location for pkgconfig file.

CMakeLists.txt

@@ -45,7 +45,7 @@ tde_setup_install_path( EXEC_INSTALL_PREFIX   "${CMAKE_INSTALL_PREFIX}" )
 tde_setup_install_path( BIN_INSTALL_DIR       "${EXEC_INSTALL_PREFIX}/bin"  )
 tde_setup_install_path( LIB_INSTALL_DIR       "${EXEC_INSTALL_PREFIX}/lib${LIB_SUFFIX}" )
 tde_setup_install_path( INCLUDE_INSTALL_DIR   "${CMAKE_INSTALL_PREFIX}/include/${CMAKE_PROJECT_NAME}" )
-tde_setup_install_path( PKGCONFIG_INSTALL_DIR "/usr/lib${LIB_SUFFIX}/pkgconfig" )
+tde_setup_install_path( PKGCONFIG_INSTALL_DIR "${LIB_INSTALL_DIR}/pkgconfig" )
 
 
 ##### setup architecture flags ##################