Steps to reproduce:

1. $ ./configure --prefix=/usr/local/zabbix-install --enable-agent -q
   
   
   Configuration:
   
   Detected OS: linux-gnu
   Install path: /usr/local/zabbix-install
   Compilation arch: linux
   
   Compiler: cc
   Compiler flags: -g -O2 
   
   Library-specific flags:
   
   Enable server: no
   
   Enable proxy: no
   
   Enable agent: yes
   Agent details:
   TLS: no
   Linker flags: -rdynamic 
   Libraries: -lm -ldl -lresolv -lpcreposix -lpcre 
   Config file: /usr/local/zabbix-install/etc/zabbix_agentd.conf
   Modules: /usr/local/zabbix-install/lib/modules
   
   Enable Java gateway: no
   
   LDAP support: no
   IPv6 support: no
   
   ***********************************************************
   * Now run 'make install' *
   * *
   * Thank you for using Zabbix! *
   * <http://www.zabbix.com> *
   ***********************************************************
   

1. $ make -s DESTDIR=/tmp/zabbix-destdir install
   Making install in src
   Making install in libs
   Making install in zbxcrypto
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxcommon
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxlog
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxalgo
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxnix
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxconf
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxhttp
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxsysinfo
   Making install in agent
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in common
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in simple
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in linux
   ar: `u' modifier ignored since `D' is the default (see `U')
   ar: `u' modifier ignored since `D' is the default (see `U')
   ar: `u' modifier ignored since `D' is the default (see `U')
   ar: `u' modifier ignored since `D' is the default (see `U')
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxsys
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxcomms
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxjson
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxexec
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxmodules
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxregexp
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxipcservice
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zbxcompress
   ar: `u' modifier ignored since `D' is the default (see `U')
   Making install in zabbix_agent
   /bin/mkdir -p '/tmp/zabbix-destdir/usr/local/zabbix-install/sbin'
   /usr/bin/install -c zabbix_agentd '/tmp/zabbix-destdir/usr/local/zabbix-install/sbin'
   /bin/mkdir: cannot create directory ‘/usr/local/zabbix-install’: Permission denied
   

Result:
make install fails because of incorrectly trying to install into /
Expected:
make install succeeds installing everything under /tmp/zabbix-destdir

Files/directories affected:

Agent

• /etc/zabbix/zabbix_agentd.conf
• /etc/zabbix/zabbix_agentd.conf.d
• /usr/lib/zabbix/modules

Server

• /etc/zabbix/zabbix_server.conf
• /etc/zabbix/zabbix_server.conf.d
• /usr/share/zabbix/externalscripts
• /usr/share/zabbix/alertscripts
• /usr/lib/zabbix/modules

Proxy

• /etc/zabbix/zabbix_proxy.conf
• /etc/zabbix/zabbix_proxy.conf.d
• /usr/share/zabbix/externalscripts
• /usr/lib/zabbix/modules