$ ./configure --enable-agent
$ make
[...]

cc -g zabbix_agentd_SOURCES = active.c active.h stats.c stats.h cpustat.c cpustat.h diskdevices.c diskdevices.h perfstat.c perfstat.h vmstats.c vmstats.h logfiles.c logfiles.h zabbix_agentd.c zbxconf.c zbxconf.h listener.c listener.h eventlog.c eventlog.h -o zabbix_agent zabbix_agent.o stats.o cpustat.o diskdevices.o perfstat.o vmstats.o zbxconf.o ../../src/libs/zbxsysinfo/libzbxagentsysinfo.a ../../src/libs/zbxsysinfo/hpux/libspecsysinfo.a ../../src/libs/zbxsysinfo/common/libcommonsysinfo.a ../../src/libs/zbxsysinfo/simple/libsimplesysinfo.a ../../src/libs/zbxlog/libzbxlog.a ../../src/libs/zbxalgo/libzbxalgo.a ../../src/libs/zbxsys/libzbxsys.a ../../src/libs/zbxnix/libzbxnix.a ../../src/libs/zbxcomms/libzbxcomms.a ../../src/libs/zbxconf/libzbxconf.a ../../src/libs/zbxcommon/libzbxcommon.a ../../src/libs/zbxcrypto/libzbxcrypto.a ../../src/libs/zbxjson/libzbxjson.a ../../src/libs/zbxexec/libzbxexec.a zabbix_agent_SOURCES = zabbix_agent.c stats.c stats.h cpustat.c cpustat.h diskdevices.c diskdevices.h perfstat.c perfstat.h vmstats.c vmstats.h zbxconf.c zbxconf.h -lm
active.c:
cpp: "active.c", line 20: error 4036: Can't open include file 'common.h'.
cpp: "active.h", line 23: error 4036: Can't open include file 'threads.h'.
cpp: "active.c", line 23: error 4036: Can't open include file 'cfg.h'.
cpp: "active.c", line 24: error 4036: Can't open include file 'log.h'.
cpp: "active.c", line 30: error 4036: Can't open include file 'comms.h'.
cpp: "active.c", line 31: error 4036: Can't open include file 'threads.h'.
cpp: "active.c", line 32: error 4036: Can't open include file 'zbxjson.h'.
[...]