Seems that USE_MULTI and USE_IMP_SYS have to match - either both defined or both undefined.

Not quite. Both USE_IMP_SYS and USE_ITHREADS require USE_MULTI, but not the other way around. USE_MULTI can be used without either of the other two.

In reply to Re^3: Win32 unthreaded perl builds: To USE_MULTI or not ? by ikegami
in thread Win32 unthreaded perl builds: To USE_MULTI or not ? by syphilis

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