1 files changed, 2 insertions, 0 deletions
diff --git a/main.c b/main.c
index 422f1406..2691e224 100644
--- a/main.c
+++ b/main.c
@@ -472,6 +472,8 @@ main(int argc, char **argv)
 		case 'M':
 #ifdef HAVE_MPFR
 			do_flags |= DO_MPFR;
+#else
+			warning(_("-M ignored: MPFR/GMP support not compiled in"));
 #endif
 			break;