Fix haiku/gcc2 build.

src/Makefile

@@ -264,7 +264,7 @@ endif
       LUACOPT = -D__ENABLE_LUA__ $(shell pkg-config $(LUAPKG) --cflags)
       LUALOPT = $(shell pkg-config $(LUAPKG) --libs)
     endif
-    COPT = -W -Wall -Werror -g $(shell sdl-config --cflags) $(TTFCOPT) -I/boot/common/include $(LUACOPT)
+    COPT = -W -Wall -g $(shell sdl-config --cflags) $(TTFCOPT) -I/boot/common/include $(LUACOPT)
     COPT += -DENABLE_FILENAMES_ICONV
     LOPT = $(shell sdl-config --libs) -lSDL_image -lpng -ljpeg -lz $(TTFLOPT) -lfreetype -lbe $(LUALOPT) -liconv
     CC = gcc

src/readline.c

@@ -402,6 +402,8 @@ bye:
     return dst;
 
   #elif defined __HAIKU__
+  if (unicode)
+    *unicode = NULL;
   return haiku_get_clipboard();
   #else
   // Not implemented (no standard) on Linux systems. Maybe someday...