===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/crt0/c1args.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -p -u -r1.3 -r1.4
--- djgpp/src/libc/crt0/c1args.c	1998/07/26 13:33:36	1.3
+++ /cvs/djgpp/djgpp/src/libc/crt0/c1args.c	1999/03/20 21:59:50	1.4
@@ -376,7 +376,7 @@ __crt0_setup_arguments(void)
           argv0[i] = '/';
       if (!(_crt0_startup_flags & _CRT0_FLAG_PRESERVE_UPPER_CASE))
         if (isupper(argv0[i]))
-          argv0[i] = tolower(argv0[i]);
+          argv0[i] = tolower((unsigned char)argv0[i]);
     }
     if (_crt0_startup_flags & _CRT0_FLAG_DROP_EXE_SUFFIX)
     {