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diff -Nrup a/acinclude.m4 b/acinclude.m4
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--- a/acinclude.m4	2006-02-12 02:26:40.000000000 -0700
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+++ b/acinclude.m4	2020-01-16 08:53:45.111761351 -0700
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@@ -53,7 +53,7 @@ AC_CACHE_VAL(q_cv_must_reinstall_sighand
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 #include <unistd.h>
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 #endif
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 typedef RETSIGTYPE sigfunc();
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-int nsigint;
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+volatile int nsigint;
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 #ifdef HAVE_POSIX_SIGNALS
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 sigfunc *
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 set_signal_handler(sig, handler)