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diff -r -U3 m4-1.4/src/m4.c m4-1.4-patched/src/m4.c
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--- src/m4.c 1994-11-02 03:14:28.000000000 +0000
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+++ src/m4.c 2021-01-15 00:19:21.947654461 +0000
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@@ -19,7 +19,7 @@
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#include "m4.h"
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#include <getopt.h>
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-#include <sys/signal.h>
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+#include <signal.h>
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static void usage _((int));
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