[root@server ~]# /opt/plesk/php/7.3/bin/pecl install apcu
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
downloading apcu-5.1.18.tgz ...
Starting to download apcu-5.1.18.tgz (94,668 bytes)
.....................done: 94,668 bytes

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in PEAR/PackageFile/v2/Validator.php on line 1933
PHP Warning:  "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /opt/plesk/php/7.3/share/pear/PEAR/PackageFile/v2/Validator.php on line 1933
39 source files, building
running: phpize
Can't find PHP headers in /usr/include/php
The php-devel package is required for use of this command.
ERROR: `phpize' failed
[root@server ~]# WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
downloading apcu-5.1.18.tgz ...
Starting to download apcu-5.1.18.tgz (94,668 bytes)
.....................done: 94,668 bytes

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in PEAR/PackageFile/v2/Validator.php on line 1933
-bash: WARNING:: command not found
PHP Warning:  "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /opt/plesk/php/7.3/share/pear/PEAR/PackageFile/v2/Validator.php on line 1933[root@server ~]# downloading apcu-5.1.18.tgz ...
Can't find PHP headers in /usr/include/php
The php-devel package is required for use of this command.
ERROR: `phpize' failed
-bash: downloading: command not found
[root@server ~]# Starting to download apcu-5.1.18.tgz (94,668 bytes)
-bash: syntax error near unexpected token `('
[root@server ~]# .....................done: 94,668 bytes
-bash: .....................done:: command not found
[root@server ~]#
[root@server ~]# Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in PEAR/PackageFile/v2/Validator.php on line 1933
-bash: Warning:: command not found
[root@server ~]# PHP Warning:  "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /opt/plesk/php/7.3/share/pear/PEAR/PackageFile/v2/Validator.php on line 1933
-bash: PHP: command not found
[root@server ~]# 39 source files, building
-bash: 39: command not found
[root@server ~]# running: phpize
-bash: running:: command not found
[root@server ~]# Can't find PHP headers in /usr/include/php
> The php-devel package is required for use of this command.
> ERROR: `phpize' failed
-bash: Cant find PHP headers in /usr/include/php
The php-devel package is required for use of this command.
ERROR: `phpize: No such file or directory
[root@server ~]# ^C