mpi is not strictly require in allquestions.c

src/questions/allquestions.c

@@ -15,7 +15,9 @@
 #include <openssl/x509.h>
 #include <openssl/rsa.h>
 #include <openssl/ssl.h>
+#ifdef HAVE_OPENMPI
 #include <mpi.h>
+#endif
 
 #include "qa/questions/questions.h"