Install OpenSSL with ALPN support
cd /usr/local/src/
wget ftp://ftp.openssl.org/source/openssl-1.0.2j.tar.gz
tar xzf openssl-1.0.2j.tar.gz
cd openssl-1.0.2j
./config --prefix=/usr/local/lib_http2 no-ssl2 no-ssl3 zlib-dynamic -fPIC
make depend
make install
Install nghttp2 - HTTP/2 Library
cd /usr/local/directadmin/custombuild
./build update
./build nghttp2
Install HTTP/2 for Apache 2.x
cd /usr/local/directadmin/custombuild
mkdir -p custom/ap2
cp -p configure/ap2/configure.apache custom/ap2/configure.apache
vi custom/ap2/configure.apache
### REPLACE "--with-ssl=/usr" \
### WITH:
"--enable-http2" \
"--enable-ssl-staticlib-deps" \
"--with-ssl=/usr/local/lib_http2" \
### Rebuild apache
./build apache
### Add HTTP/2 settings to httpd-includes.conf
