Modified to work with winmain.c for compile under MinGW

src/nghelp.c

@@ -36,8 +36,17 @@ char *hlp_filelist[] = { "ngspice", 0 };
 
 extern void ivars();
 
+#ifdef HAS_WINDOWS
+bool oflag = FALSE;         /* Output over redefined I/O functions */
+FILE *flogp;  /* hvogt 15.12.2001 */
+#endif /* HAS_WINDOWS */
+
 int
+#ifdef HAS_WINDOWS
+xmain(int ac, char **av)
+#else
 main(int ac, char **av)
+#endif /* HAS_WINDOWS */
 {
     wordlist *wl = NULL;