diff -Nrup a/src/lib/SoftHSM.cpp b/src/lib/SoftHSM.cpp
--- a/src/lib/SoftHSM.cpp	2019-09-23 10:45:59.979484657 -0600
+++ b/src/lib/SoftHSM.cpp	2019-09-23 10:46:46.394199562 -0600
@@ -78,6 +78,7 @@
 
 #include <stdlib.h>
 #include <algorithm>
+#include <stdexcept>
 
 // Initialise the one-and-only instance