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--- a/src/libs/libgroff/getopt.c
+++ b/src/libs/libgroff/getopt.c
@@ -122,7 +122,7 @@
whose names are inconsistent. */
#ifndef getenv
-extern char *getenv ();
+extern char *getenv (const char *);
#endif
#endif /* not __GNU_LIBRARY__ */
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