Your bug report

#31095: [aegisub] error: Aegisub requires that boost be built with ICU support.

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 31095@debbugs.gnu.org.

-- 
31095: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31095
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