Document that -k is available only with libunwind
Without this users might get confused why `man strace` describes an option that doesn't work. * strace.1: Note that -k is available only if strace is built with libunwind.
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strace.1
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strace.1
@ -269,6 +269,9 @@ Print the instruction pointer at the time of the system call.
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.TP
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.B \-k
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Print the execution stack trace of the traced processes after each system call (experimental).
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This option is available only if
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.B strace
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is built with libunwind.
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.TP
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.B \-q
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Suppress messages about attaching, detaching etc. This happens
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