--- Wnn/romkan/rk_modread.c.orig
+++ Wnn/romkan/rk_modread.c
@@ -62,6 +62,7 @@
     ѥˡWnnΥ󥯥롼ɥեΤ꤫ꤷƤȡ*/
 #endif
 #include <pwd.h>
+#include <unistd.h>
 
 #define Terminator 0 /* intnaibu[]ˤνߥ */
 
