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diff -up cups-1.5b1/backend/serial.c.serial cups-1.5b1/backend/serial.c
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--- cups-1.5b1/backend/serial.c.serial	2011-05-20 05:49:49.000000000 +0200
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+++ cups-1.5b1/backend/serial.c	2011-05-23 17:34:33.000000000 +0200
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@@ -75,6 +75,7 @@
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 #endif /* __APPLE__ */
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 #if defined(__linux) && defined(TIOCGSERIAL)
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+#  include <linux/types.h>
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 #  include <linux/serial.h>
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 #  include <linux/ioctl.h>
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 #endif /* __linux && TIOCGSERIAL */