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First server:
root@debian:~/.ssh# nginx -V
nginx version: nginx/1.6.0
built by gcc 4.7.2 (Debian 4.7.2-5)
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2' --with-ld-opt=-Wl,-z,relro --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-file-aio --with-http_spdy_module --with-http_addition_module --with-http_dav_module --with-http_geoip_module --with-http_gzip_static_module --with-http_image_filter_module --with-http_secure_link_module --with-http_sub_module --with-http_xslt_module --with-mail --with-mail_ssl_module --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-auth-pam --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-dav-ext-module --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-echo --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-upstream-fair --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-syslog --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-cache-purge --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/ngx_http_pinba_module --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/ngx_http_substitutions_filter_module --add-module=/usr/src/nginx/source/nginx-1.6.0/debian/modules/nginx-x-rid-header --with-ld-opt=-lossp-uuid

2nd Server
root@test:/var/log/nginx# nginx -V
nginx version: nginx/1.7.1
built by gcc 4.7.2 (Debian 4.7.2-5)
TLS SNI support enabled
configure arguments: --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-http_spdy_module --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,--as-needed' --with-ipv6

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Matt Worthington