Index: strongswan-5.2.1/src/_updown/_updown.in
===================================================================
--- strongswan-5.2.1.orig/src/_updown/_updown.in
+++ strongswan-5.2.1/src/_updown/_updown.in
@@ -125,7 +125,7 @@
 #
 
 # define a minimum PATH environment in case it is not set
-PATH="/sbin:/bin:/usr/sbin:/usr/bin:@sbindir@"
+PATH="${PATH:-/sbin:/bin:/usr/sbin:/usr/bin}"
 export PATH
 
 # uncomment to log VPN connections
Index: strongswan-5.2.1/src/libcharon/plugins/updown/updown_listener.c
===================================================================
--- strongswan-5.2.1.orig/src/libcharon/plugins/updown/updown_listener.c
+++ strongswan-5.2.1/src/libcharon/plugins/updown/updown_listener.c
@@ -240,6 +240,8 @@ static void invoke_once(private_updown_l
 	process_t *process;
 	char *envp[128] = {};
 
+	push_env(envp, countof(envp), "PATH=%s", getenv("PATH"));
+
 	me = ike_sa->get_my_host(ike_sa);
 	other = ike_sa->get_other_host(ike_sa);