Comipling dynamic ngx_cache_purge fail


I’m using this steps for compile ngx_cache_purge

$ nginx -v
nginx version: nginx/1.17.10
$ version=1.17.10
wget -qO -$version.tar.gz | tar zxfv -
$ wget
$ tar xvfz ngx_cache_purge-2.3.tar.gz
$ cd ../nginx-${version}
$ ./configure --add-dynamic-module=../ngx_cache_purge-2.3/
configuring additional dynamic modules
adding module in ../ngx_cache_purge-2.3
 + ngx_http_cache_purge_module was configured
$ sudo make modules
make -f objs/Makefile modules
make[1]: Entering directory '/mypath/soft/nginx-1.17.10'
make[1]: Nothing to be done for 'modules'.
make[1]: Leaving directory '/mypath/soft/nginx-1.17.10'

I’m using this method for other modules such pagespeed, and work fine.

What is my mistake?