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diff --git a/src/MushRuby/lex.c b/src/MushRuby/lex.c
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index a851447..f2f8396 100644
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--- a/src/MushRuby/lex.c
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+++ b/src/MushRuby/lex.c
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@@ -93,7 +93,7 @@ hash (str, len)
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 }
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 #ifdef __GNUC__
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-__inline
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+extern __inline
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 #endif
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 struct kwtable *
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 rb_reserved_word (str, len)