Get 1986/wall to work

Although under linux it compiled (as long as the compiler supports
-traditional-cpp) it did not function correctly. We used a patch from
Yusuke Endoh. Thank you Yusuke!

1986/wall/README.md

@@ -13,7 +13,9 @@ US of A
 
 NOTE: On modern systems this entry requires the option `-traditional-cpp` which
 clang does not support. Please be advised that gcc under macOS is actually
-clang so this will not compile with the default gcc under macOS.
+clang so this will not compile with the default gcc under macOS. As this entry
+stood in modern systems it did not work even when compiled. We used a patch
+provided by Yusuke Endoh to make it work. Thank you Yusuke!
 
 ## Judges' comments:
 
@@ -27,6 +29,11 @@ the warning message generated by the C compiler.  Then execute the
 program and type characters into its standard input.  You will see why
 the compiler documents the program.
 
+## Author's comments:
+
+No comments were provided by the author.
+
+
 
 Copyright (c) 1986, Landon Curt Noll & Larry Bassel.
 All Rights Reserved.  Permission for personal, educational or non-profit use is

1986/wall/wall.c

@@ -13,7 +13,7 @@ ccc(
 cc)
 C
 cc;
-{
+{ cc=strdup(cc);
 C
 cccc=
 cc;int
@@ -50,7 +50,7 @@ main(c_(-)'-'-1,C_(s))_
 }main(,cc)
 C
 #define O write(1,
-c="O";
+c=strdup("O");
 O_(sy) keyboard));
 main(;;,for);
 read(0,