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From: Horváth V. (friendlyanon__at_[hidden])
Date: 2021-10-08 14:25:47


The most correct solution would be providing a separate regex-icu
package altogether, that depends on both regex and ICU, but I don't
think Boost rolls that way.

Optional dependencies are really nasty.

I guess what one could do is have a package component and request ICU
support explicitly:

     # The user requests regex with ICU, so it's safe to
     # find_dependency(ICU i18n) in the package config for ICU
     # internationalization and link it with the
     # regex/headers target
     find_package(Boost REQUIRED regexWithICU)


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