I try to follow this topic http://www.forum.directadmin.com/showthread.php?t=52590

and i use Nginx_Apache
But results "ALPN is not supported." follow link

I did below...

To enable HTTP/2 in Nginx:
cd /usr/local/src/
wget ftp://ftp.openssl.org/source/openssl-1.1.0g.tar.gz
tar xzf openssl-1.1.0g.tar.gz

and then
For Nginx_Apache:
cd /usr/local/directadmin/custombuild
mkdir -p custom/nginx_reverse
cp -p configure/nginx_reverse/configure.nginx custom/nginx_reverse/configure.nginx

Build Nginx with statically linked OpenSSL library:
1) Edit configure.nginx which was copied to custom/ folder
2) Add "--with-openssl=/usr/local/src/openssl-1.1.0g" and "--with-http_v2_module" flags
3) Run ./build nginx
And error

/usr/local/directadmin/custombuild/custom/nginx_reverse/configure.nginx permssion denied
please check /usr/local/directadmin/custombuild/custom/nginx_reverse/configure.nginx file.

What wrong with this case?
or i need to Enable http2 in Apache first?
Thank you very much.