# define putenv PerlEnv_putenv
# define getenv PerlEnv_getenv
# define uname PerlEnv_uname
-# define stdin PerlSIO_stdin()
-# define stdout PerlSIO_stdout()
-# define stderr PerlSIO_stderr()
+# define stdin PerlSIO_stdin
+# define stdout PerlSIO_stdout
+# define stderr PerlSIO_stderr
# define fopen PerlIO_open
# define fclose PerlIO_close
# define feof PerlIO_eof
# define setbuf PerlSIO_setbuf
# define setvbuf PerlSIO_setvbuf
# define setlinebuf PerlSIO_setlinebuf
-# define stdoutf PerlIO_stdoutf
-# define vfprintf PerlIO_vprintf
+# define stdoutf PerlSIO_stdoutf
+# define vfprintf PerlSIO_vprintf
# define ftell PerlIO_tell
# define fseek PerlIO_seek
# define fgetpos PerlIO_getpos