I can't build aegisub:

	> guix package --install aegisub
  [...]
	checking whether boost ICU support works... no
	configure: error: in `/tmp/guix-build-aegisub-3.2.2.drv-0/aegisub-3.2.2':
	configure: error: Aegisub requires that boost be built with ICU support.
	See `config.log' for more details
	phase `configure' failed after 7.4 seconds
	builder for `/gnu/store/97g8fxipy942yzs0zp5hbvsj90hw1xc6-aegisub-3.2.2.drv' failed with exit code 1
	guix package: error: build failed: build of `/gnu/store/97g8fxipy942yzs0zp5hbvsj90hw1xc6-aegisub-3.2.2.drv' failed

It seems that the boost input is missing ICU support.

-- 
Pierre Neidhardt