How to add new package build rules to Debian?

Question

Debian

All good afternoon.
There is a similar nginx build file (regular):

#!/usr/bin/make -f

#export DH_VERBOSE=1
CFLAGS ?= $(shell dpkg-buildflags --get CFLAGS)
LDFLAGS ?= $(shell dpkg-buildflags --get LDFLAGS)
WITH_SPDY := $(shell printf "Source: nginx\nBuild-Depends: libssl-dev (>= 1.0.1)\n" | \
  dpkg-checkbuilddeps - >/dev/null 2>&1 && \
  echo "--with-http_spdy_module")

%:
  dh [email protected]

override_dh_auto_configure: configure_debug

override_dh_strip:
  dh_strip -Xdebug

override_dh_auto_build:
  dh_auto_build
  mv objs/nginx objs/nginx.debug
  CFLAGS="" ./configure \
    --prefix=/etc/nginx \
    --sbin-path=/usr/sbin/nginx \
    --conf-path=/etc/nginx/nginx.conf \
    --error-log-path=/var/log/nginx/error.log \
    --http-log-path=/var/log/nginx/access.log \
    --pid-path=/var/run/nginx.pid \
    --lock-path=/var/run/nginx.lock \
    --http-client-body-temp-path=/var/cache/nginx/client_temp \
    --http-proxy-temp-path=/var/cache/nginx/proxy_temp \
    --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp \
    --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp \
    --http-scgi-temp-path=/var/cache/nginx/scgi_temp \
    --user=nginx \
    --group=nginx \
    --with-http_ssl_module \
    --with-http_realip_module \
    --with-http_addition_module \
    --with-http_sub_module \
    --with-http_dav_module \
    --with-http_flv_module \
    --with-http_mp4_module \
    --with-http_gunzip_module \
    --with-http_gzip_static_module \
    --with-http_random_index_module \
    --with-http_secure_link_module \
    --with-http_stub_status_module \
    --with-http_auth_request_module \
    --with-mail \
    --with-mail_ssl_module \
    --with-file-aio \
    $(WITH_SPDY) \
    --with-cc-opt="$(CFLAGS)" \
    --with-ld-opt="$(LDFLAGS)" \
    --with-ipv6
  dh_auto_build

configure_debug:
  CFLAGS="" ./configure \
    --prefix=/etc/nginx \
    --sbin-path=/usr/sbin/nginx \
    --conf-path=/etc/nginx/nginx.conf \
    --error-log-path=/var/log/nginx/error.log \
    --http-log-path=/var/log/nginx/access.log \
    --pid-path=/var/run/nginx.pid \
    --lock-path=/var/run/nginx.lock \
    --http-client-body-temp-path=/var/cache/nginx/client_temp \
    --http-proxy-temp-path=/var/cache/nginx/proxy_temp \
    --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp \
    --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp \
    --http-scgi-temp-path=/var/cache/nginx/scgi_temp \
    --user=nginx \
    --group=nginx \
    --with-http_ssl_module \
    --with-http_realip_module \
    --with-http_addition_module \
    --with-http_sub_module \
    --with-http_dav_module \
    --with-http_flv_module \
    --with-http_mp4_module \
    --with-http_gunzip_module \
    --with-http_gzip_static_module \
    --with-http_random_index_module \
    --with-http_secure_link_module \
    --with-http_stub_status_module \
    --with-http_auth_request_module \
    --with-mail \
    --with-mail_ssl_module \
    --with-file-aio \
    $(WITH_SPDY) \
    --with-cc-opt="$(CFLAGS)" \
    --with-ld-opt="$(LDFLAGS)" \
    --with-ipv6 \
    --with-debug

override_dh_auto_install:
  dh_auto_install
  /usr/bin/install -m 644 debian/nginx.conf debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/win-utf debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/koi-utf debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/koi-win debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/mime.types debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/scgi_params debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/fastcgi_params debian/nginx/etc/nginx/
  /usr/bin/install -m 644 conf/uwsgi_params debian/nginx/etc/nginx/
  /usr/bin/install -m 644 html/index.html debian/nginx/usr/share/nginx/html/
  /usr/bin/install -m 644 html/50x.html debian/nginx/usr/share/nginx/html/
  /usr/bin/install -m 644 debian/nginx.vh.default.conf debian/nginx/etc/nginx/conf.d/default.conf
  /usr/bin/install -m 644 debian/nginx.vh.example_ssl.conf debian/nginx/etc/nginx/conf.d/example_ssl.conf
  /usr/bin/install -m 755 objs/nginx  debian/nginx/usr/sbin/

I use several additional nginx builds with different modules (that is, configure and install sections). Now I collect them in separate metadata. There is a desire to combine everything into one rules file. Help to create this please, unfortunately there is not much experience in writing make and rules files.