diff -uNr lazyread-2.0/lazyread.c lazyread-2.0.mod/lazyread.c
--- lazyread-2.0/lazyread.c	2003-02-02 15:28:15.000000000 +0200
+++ lazyread-2.0.mod/lazyread.c	2020-01-04 15:57:14.580179280 +0200
@@ -393,7 +393,9 @@
             snprintf(command, (strlen(lesscommand) + strlen(qfilename)), lesscommand, qfilename);
         }
         system(command); /* run lesspipe.sh */
-    }
+    } else {
+		printf("LESSOPEN is not set!\n");
+	}
 
     if (!(fp_write = fopen(lfile.lazy_file, "r"))) 
         my_perror("fopen()");