diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ce66a3b..0491bbbb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,9 @@ if(UNIX)
 
   include(CheckIncludeFile)
   Check_Include_File(sys/auxv.h HAVE_SYS_AUXV)
+  if(EXISTS "/lib/systemd/system")
+    set(CMAKE_INSTALL_SYSTEMD_UNITDIR "/lib/systemd/system" CACHE STRING "Where to install systemd unit files")
+  endif()
 endif()
 
 configure_file("${TOP_DIRECTORY}/AUTHORS.TXT" "${TOP_DIRECTORY}/src/bin/hamcore/authors.txt" COPYONLY)
diff --git a/src/vpnbridge/CMakeLists.txt b/src/vpnbridge/CMakeLists.txt
index fb076876..34dd6b4c 100644
--- a/src/vpnbridge/CMakeLists.txt
+++ b/src/vpnbridge/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnbridge" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnbridge/vpnbridge")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnbridge.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnbridge.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnbridge.service
       COMPONENT "vpnbridge"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()
diff --git a/src/vpnclient/CMakeLists.txt b/src/vpnclient/CMakeLists.txt
index 9df369ec..24a3196a 100644
--- a/src/vpnclient/CMakeLists.txt
+++ b/src/vpnclient/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnclient" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnclient/vpnclient")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnclient.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnclient.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnclient.service
       COMPONENT "vpnclient"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()
diff --git a/src/vpnserver/CMakeLists.txt b/src/vpnserver/CMakeLists.txt
index 26142ee4..dd17f3d6 100644
--- a/src/vpnserver/CMakeLists.txt
+++ b/src/vpnserver/CMakeLists.txt
@@ -40,11 +40,11 @@ if(UNIX)
   )
 
   install_wrapper_script("vpnserver" "${CMAKE_INSTALL_FULL_LIBEXECDIR}/softether/vpnserver/vpnserver")
-  if(EXISTS "/lib/systemd/system")
+  if(NOT "${CMAKE_INSTALL_SYSTEMD_UNITDIR}" STREQUAL "")
     configure_file(${TOP_DIRECTORY}/systemd/softether-vpnserver.service ${CMAKE_BINARY_DIR}/systemd/softether-vpnserver.service)
     install(FILES ${CMAKE_BINARY_DIR}/systemd/softether-vpnserver.service
       COMPONENT "vpnserver"
-      DESTINATION "/lib/systemd/system"
+      DESTINATION ${CMAKE_INSTALL_SYSTEMD_UNITDIR}
       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
     )
   endif()