php-intl fell off on mac big sur. PHP-7.3 under homebrew. How to fix?

Question

macOS

Problem. Set up a working environment nginx+php-fpm under brew, everything worked fine. For working reasons, the version of php is 7.3, and so far it will not be possible to change it - for the same reasons.
I don't know why, but after installing some additional package with brew - brew install .... - a lot of important packages were removed, I see that php does not work at all, I installed [email protected] again, it seems to work. But now there is no intl extention, and I can't install it in any way. All google clambered - nothing works.
For example, it is proposed to install with pecl -
sudo pecl install intl

the installation starts, but as soon as it reaches the assembly, it crashes with an error:

#include <php.h>
         ^~~~~~~
1 error generated.
make: *** [php_intl.lo] Error 1
ERROR: `make' failed

I try from the sources - the same thing, configure is fine, but as soon as I start building - make - 'php.h' file not found
I try again brew reinstall [email protected] - everything is fine, no errors, but no intl. And without it, nothing.
What else can you try?