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--- ./compat/svis.c.orig
+++ ./compat/svis.c
@@ -71,7 +71,7 @@
#undef BELL
#define BELL '\a'
-#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
+#define isoctal(c) (((unsigned char)(c)) >= '0' && ((unsigned char)(c)) <= '7')
#define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
/*
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