Got an emerg message when I stop or reload nginx

[zloss]

When I run sbin/nginx -p . -s stop/reload, it shows :
nginx: [emerg] variables in "ssl_certificate" and "ssl_certificate_key" directives are not supported on this platform

The version is:

nginx version: nginx/1.28.0
built with LibreSSL 4.1.0
TLS SNI support enabled
configure arguments: --prefix=/home/work/app/nginx --user=work --group=work --with-threads --with-file-aio --with-http_ssl_module --with-http_v2_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module --with-http_gzip_static_module --with-http_dav_module --with-http_auth_request_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-stream --with-stream_ssl_module --with-stream_realip_module --with-pcre-opt='--enable-static --disable-shared --enable-jit --with-pic' --with-pcre --with-pcre-jit --with-zlib=modules/zlib-1.3.1 --add-module=modules/ngx_devel_kit --add-module=modules/echo-nginx-module --add-module=modules/headers-more-nginx-module --add-module=modules/njs/nginx --add-module=modules/redis2-nginx-module --add-module=modules/set-misc-nginx-module --add-module=modules/nginx-dav-ext-module --add-module=modules/ngx_sqlite --add-module=modules/ngx_dynamic_upstream --add-module=modules/nginx-keyval --add-module=modules/nginx-acme --with-openssl=modules/libressl-4.1.0

Is this an expected behavior?

[bavshin-f5]

Yes, it is expected.
LibreSSL implements a limited subset of the OpenSSL API. SSL_CTX_set_cert_cb, required by nginx to load certificates and keys from variables, is one of such missing parts.