#else /* HAVE_GRP_H */
# include <grp.h>
-# define STREQ(s1, s2) (strcmp (s1, s2) == 0)
+# define STREQ(a, b) (strcmp (a, b) == 0)
/* Like `getgroups', but for user USERNAME instead of for the current
process. Store at most MAXCOUNT group IDs in the GROUPLIST array.