diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb35761c..b95ae870 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,9 @@ if (NOT ${PROJECT_VERSION} VERSION_EQUAL "${CurrentBuild_MAJOR}.${CurrentBuild_M
   message (FATAL_ERROR "PROJECT_VERSION does not match to src/CurrentBuild.txt")
 endif()
 
+include(GNUInstallDirs)
+set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
+
 include(CheckIncludeFile)
 Check_Include_File(sys/auxv.h HAVE_SYS_AUXV)
 
@@ -46,8 +49,11 @@ set(CPACK_PACKAGE_DESCRIPTION_FILE "${SoftEtherVPN_SOURCE_DIR}/description")
 set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "SoftEther VPN is an open-source cross-platform multi-protocol VPN program, created as an academic project in the University of Tsukuba.")
 
 # DEB
-file(WRITE "${CMAKE_CURRENT_SOURCE_DIR}/postinst" "#!/bin/sh\nldconfig")
-set(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/postinst")
+
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+  set(CPACK_DEBIAN_PACKAGE_DEBUG ON)
+endif()
+
 set(CPACK_DEB_COMPONENT_INSTALL ON)
 set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
 set(CPACK_DEBIAN_FILE_NAME "DEB-DEFAULT")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 14ae73a4..6ed83ace 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,3 @@
-include(GNUInstallDirs)
-
 # Creates wrapper scripts and installs them in the user's binaries directory, which is usually "/usr/local/bin".
 # This is required because symlinks use the folder they are in as working directory.
 macro(install_wrapper_script component target)