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get correct getenv prototype instead of cooking one up that's not going
to be useless with recent compilers
--- a/getopt.c
+++ b/getopt.c
@@ -143,9 +143,7 @@
/* Avoid depending on library functions or files
whose names are inconsistent. */
-#ifndef getenv
-extern char *getenv ();
-#endif
+#include <stdlib.h>
#endif /* not __GNU_LIBRARY__ */
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