cmake give %TOPIC_TITLE%quot;SpatianIndex not found%TOPIC_TITLE%quot;

[Festus1965]

prepared new empty folder minetest
close git minetest in it

testing with

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cmake -BUILD_CLIENT=1 -DBUILD_CLIENT=1 -DBUILD_SERVER=1 -BUILD_SERVER=1  -ENABLE_CURL -ENABLE_FREETYPE -ENABLE_GETTEXT -ENABLE_GLES -ENABLE_LEVELDB -ENABLE_REDIS -ENABLE_SOUND -ENABLE_LUAJIT -RUN_IN_PLACE=1 -VERSION_EXTRA=One

but also older version, saved old minetest folder had same issue
get

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-- *** Will build version 5.1.0-dev ***
-- Using GMP provided by system.
-- Using bundled JSONCPP library.
-- Using LuaJIT provided by system.
-- cURL support enabled.
-- GetText enabled; locales found: be;ca;cs;da;de;dv;eo;es;et;fr;he;hu;id;it;ja;jbo;kk;kn;ko;ky;lt;ms;nb;nl;pl;pt;pt_BR;ro;ru;sl;sr_Cyrl;sv;sw;tr;uk;zh_CN;zh_TW
-- Freetype enabled.
-- ncurses console enabled.
-- PostgreSQL backend enabled
-- PostgreSQL includes: /usr/include/postgresql
-- LevelDB backend enabled.
-- Redis backend enabled.
-- SpatialIndex not found!
-- Locale blacklist applied; Locales used: ca;cs;da;de;dv;eo;es;et;fr;hu;id;it;ja;jbo;kk;kn;lt;ms;nb;nl;pl;pt;pt_BR;ro;ru;sl;sr_Cyrl;sv;sw;tr;uk
-- Configuring done
-- Generating done
-- Build files have been written to: /home/thomas/minetest


so far no errors ...

so just

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-- SpatialIndex not found!

I cant find out from what this is coming to complain,
and I am looking for all problems, as I cant use chat in my own compiled clients ...
(I see the text in my client, press enter and gone ... but nothing at me or others showed up in chat)

[sfan5]

SpatialIndex is an optional dependency that can speed up mods dealing with overlapping/nested 3D volumes, such as areas.

[Festus1965]

found, and

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sudo apt install libspatialindex-dev

and so cmake

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-- SpatialIndex AreaStore backend enabled.