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https://bugs.gentoo.org/880439#c10
--- a/getopt.c
+++ b/getopt.c
@@ -43,9 +43,9 @@
#include <stdio.h>
/* We're ANSI now; we're guaranteed to have strchr(). */
#include <string.h>
+#include <unistd.h>
#define ERR(s, c) if(x_opterr){\
- extern int write();\
char errbuf[2];\
errbuf[0] = c; errbuf[1] = '\n';\
(void) write(2, argv[0], (unsigned)strlen(argv[0]));\
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