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--- a/src/utils/pathut.cpp
+++ b/src/utils/pathut.cpp
@@ -124,7 +124,8 @@
 #endif // HAVE_MKDTEMP
 	) {
 	free(cp);
-	reason = "maketmpdir: mktemp failed\n";
+	reason = "maketmpdir: mktemp failed for [" + tdir + "] : " +
+	    strerror(errno);
 	tdir.erase();
 	return false;
     }