--- a/src/lharc.c	(revision 773)
+++ a/src/lharc.c	(working copy)
@@ -628,7 +628,7 @@ 
         if (!isatty(1) && cmd == CMD_ADD)
             quiet = TRUE;
     }
-#if 0 /* Comment out; IMHO, this feature is useless. by Koji Arai */
+#ifndef MINGW32
     else {
         if (argc == 3 && !isatty(0)) { /* 1999.7.18 */
             /* Bug(?) on MinGW, isatty() return 0 on Cygwin console.
--- a/configure.ac	(revision 773)
+++ a/configure.ac	(working copy)
@@ -334,6 +334,11 @@ 
 ;;
 esac
 
+AC_MINGW32
+if test "x$MINGW32" = xyes; then
+  AC_DEFINE(MINGW32, 1, [Define to 1 if we're being compiled with MinGW.])
+fi
+
 AC_CONFIG_FILES([Makefile src/Makefile man/Makefile olddoc/Makefile])
 AC_CONFIG_FILES([tests/Makefile tests/lha-test])
 AC_OUTPUT