Add note to README.md
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@ -235,9 +235,10 @@ substitution because it was already inserted as part of the
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preprocessed on Windows.
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While there is no bulletproof way to detect such situations (because the
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unconditional check could be `BUILD2_AUTOCONF_LIBC_VERSION` itself), it is a
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good idea for checks that are based on other checks to verify that the base
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macros are in fact defined, for example:
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unconditional check could be `BUILD2_AUTOCONF_LIBC_VERSION` itself; perhaps
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we should only have private bases that are only accessed by the user via
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derived public checks), it is a good idea for checks that are based on
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other checks to verify that the base macros are in fact defined, for example:
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```
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// HAVE_EXPLICIT_BZERO : BUILD2_AUTOCONF_LIBC_VERSION
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