npc(1): without <sysexits.h> fall back to ANSI C
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@ -18,9 +18,13 @@
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#include <stdio.h> /* fprintf(3), fputs(3), getc(3), putc(3), stdin, stdout,
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* EOF */
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#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
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#include <unistd.h> /* getopt(3) */
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#if !defined EX_USAGE || !defined EX_OK
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# include <sysexits.h>
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#if !defined EX_USAGE
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# define EX_USAGE EXIT_FAILURE
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#endif
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#if !defined EX_OK
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# define EX_OK EXIT_SUCCESS
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#endif
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int main(int argc, char *argv[]){
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