Can't install bcmath through docker-php-ext-install

When I try to install the module bcmath through `docker-php-ext-install` I get the following error:
```
Build complete.
Don't forget to run 'make test'.

Installing shared extensions: /usr/local/lib/php/extensions/no-debug-non-zts-20090626/
docker-php-ext-enable bcmath.so
/usr/local/bin/docker-php-ext-enable: line 61: /usr/local/etc/php/conf.d/docker-php-ext-bcmath.ini: No such file or directory
```

Do you have any advice how to fix it?