diff -up snobol4-2.3.1/configure.noopt snobol4-2.3.1/configure
--- snobol4-2.3.1/configure.noopt	2023-03-26 13:12:22.826650002 -0400
+++ snobol4-2.3.1/configure	2023-03-26 13:12:33.679794072 -0400
@@ -453,7 +453,7 @@ gcc|clang|icc)
     CCVERS=-v
     # was -M: -MM existed in gcc 3.4
     echo 'CCM=$(CC) -MM'			>> $CONFIG_M4
-    OPT=-O3
+    # OPT=-O3
 
     # on by default in clang??
     echo 'ADD_CFLAGS([-Wall])'			>> $CONFIG_M4