doc: Document ALLOW_HOST_PACKAGES dependency option #19113

1. 
   hebasto commented at 7:28 am on May 30, 2020: member

   The ALLOW_HOST_PACKAGES dependency option is not documented in this repo at all, including https://github.com/bitcoin/bitcoin/blob/master/depends/README.md
2. fanquake added the label Docs on May 30, 2020
3. 
   skmcontrib commented at 1:10 pm on May 31, 2020: none

   @hebasto can i work on this?
4. 
   hebasto commented at 1:12 pm on May 31, 2020: member

   @hebasto can i work on this?

   Sure! Thank you @sachinkm77 !

5. 
   hebasto commented at 1:40 pm on May 31, 2020: member

   @sachinkm77

   thanks @hebasto. can you give me some pointers, since its my first contribution

   In general, the great list of resources for new contributors could be found in https://bitcoincore.reviews/

   Particularly for this issue, describing of code behavior and use cases could be enough:

   0$ git grep -n -i ALLOW_HOST_PACKAGES
   1ci/test/00_setup_env_native_qt5.sh:11:export DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1"
   2depends/Makefile:183:            -e 's|@allow_host_packages@|$(ALLOW_HOST_PACKAGES)|' \
   3depends/config.site.in:68:if test -z "@allow_host_packages@"; then
   

   Some knowledge of GNU Make and shell scripting is required.

6. 
   skmcontrib commented at 1:40 pm on May 31, 2020: none

   Thanks @hebasto . I will work on it.
7. laanwj referenced this in commit c1564baf3b on Oct 27, 2020
8. 
   hebasto commented at 9:23 am on October 27, 2020: member

   Closing via #19124.
9. hebasto closed this on Oct 27, 2020

   ---

10. sidhujag referenced this in commit 4487add335 on Oct 27, 2020
11. DrahtBot locked this on Feb 15, 2022

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