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* configure.in (CRT_DIR): New output variable.
(--with-crt-dir): New option.  (Bug#5655)
(HAVE_LIB64_DIR): Remove.

* src/Makefile.in (CRT_DIR): New variable, set by configure.
* src/m/amdx86-64.h, m/ibms390x.h (START_FILES, LIB_STANDARD):
Use $CRT_DIR rather than HAVE_LIB64_DIR.  (Bug#5655)