--- euses-2.5.2/euses.c	2006-11-24 19:18:07.000000000 +0100
+++ work/euses.c	2006-11-24 19:21:28.000000000 +0100
@@ -128,10 +128,13 @@
 	FILE *fd;
 
 	/* Check if PORTDIR is set in the environment */
-	snprintf(portdir, FILENAME_MAX, "%s", getenv("PORTDIR"));
+	char *envportdir = getenv("PORTDIR");
+	if (envportdir != NULL) {
+		snprintf(portdir, FILENAME_MAX, "%s", envportdir);
+	}
 
 	/* or load it from make.{globals,conf} */
-	if (strlen(portdir) == 0) {
+	else {
 		/* Open a pipe to sh */
 		fd = popen("source " SYSCONFDIR "/make.globals;" "source "
 			   SYSCONFDIR "/make.conf" ";" "echo -n ${PORTDIR}",