patch -R -c bxbasm.c <<EOD
*** bxbasm.c    2004-05-12 22:00:25.000000000 -0500
--- /dev/stdin        2004-05-12 22:01:05.000000000 -0500
***************
*** 1,14 ****
  /* bxbasm.c : masm32 alpha version.1.5 */

  /* #define Power_C */
! /* Not on Unix: #define LccWin32 */

  /* --- declare headers --- */
  #include <stdio.h>
- #ifdef LccWin32
  #include <conio.h>
  #include <io.h>
- #endif
  #include <stdlib.h>
  #include <ctype.h>
  #include <string.h>
--- 1,12 ----
  /* bxbasm.c : masm32 alpha version.1.5 */

  /* #define Power_C */
! #define LccWin32

  /* --- declare headers --- */
  #include <stdio.h>
  #include <conio.h>
  #include <io.h>
  #include <stdlib.h>
  #include <ctype.h>
  #include <string.h>
EOD
cc -o bxbasm bxbasm.c