How to incorporate module in broker_module?

[Atoosah]

- I'm new to developing in Nagios and am having trouble adding the
helloworld module that comes in the  nagios-3.1.0/module/ directory. When
using the suggested command of "gcc -shared -o helloworld.o helloworld.c" or
the given module/Makefile or via nagios's overall "make all" (when removing
the -undefined supress gcc option) I receive the following error:
--------------------------------------------
ERROR BELOW:
--------------------------------------------
[module]$ gcc -shared -o helloworld.o helloworld.c
Undefined symbols:
  "_main", referenced from:
      start in crt1.10.5.o
  "_schedule_new_event", referenced from:
      _nebmodule_init in cctSjeOe.o
  "_neb_deregister_callback", referenced from:
      _nebmodule_deinit in cctSjeOe.o
  "_write_to_all_logs", referenced from:
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
      _nebmodule_deinit in cctSjeOe.o
      _helloworld_reminder_message in cctSjeOe.o
      _helloworld_handle_data in cctSjeOe.o
  "_neb_set_module_info", referenced from:
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
      _nebmodule_init in cctSjeOe.o
  "_neb_register_callback", referenced from:
      _nebmodule_init in cctSjeOe.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
[module]$
--------------------------------------------

- The neb_set_module_info function does exist, shown below:
[nagios-3.1.0]$ grep -Hnr "neb_set_module_info" *cd ..
Binary file base/nagios matches
Binary file base/nagios.dSYM/Contents/Resources/DWARF/nagios matches
base/nebmods.c:391:int neb_set_module_info(void *handle, int type, char
*data){
Binary file base/nebmods.o matches
include/nebmodules.h:96:int neb_set_module_info(void *,int,char *);
module/helloworld.c:61:
neb_set_module_info(helloworld_module_handle,NEBMODULE_MODINFO_TITLE,"helloworld");
[nagios-3.1.0]$

--------------------------------------------
Makefile BELOW
--------------------------------------------

# Makefile for NEB examples

#

# Last Modified: 12-14-2007



# Source code directories

SRC_INCLUDE=../include


CC=gcc

MOD_CFLAGS= -fno-common

CFLAGS=-g -O2 -I/sw/include/ -DHAVE_CONFIG_H

#MOD_LDFLAGS=-bundle -flat_namespace -undefined suppress

MOD_LDFLAGS=-bundle -flat_namespace

LDFLAGS= -L/sw/lib/

LIBS=


prefix=/usr/local/nagios

exec_prefix=${prefix}

BINDIR=${exec_prefix}/bin

INSTALL=/usr/bin/install -c

INSTALL_OPTS=-o nagios -g nagios

COMMAND_OPTS=-o nagios -g nagiocmd

STRIP=/usr/bin/strip


CP=@CP@


all:    helloworld.o


helloworld.o: helloworld.c

        $(CC) $(MOD_CFLAGS) $(CFLAGS) -o helloworld.o helloworld.c
$(MOD_LDFLAGS) $(LDFLAGS) $(LIBS)
--------------------------------------------

- Finally, I copy helloworld.o from where nagios runs and enable the
even_broker in nagios.cfg"
broker_module=/usr/local/nagios/bin/helloworld.o

Why would gcc not find/compile the needed files? I'd appreciate any pointers
you would give in how to successfully compile the sample module.

thank you,
atoosaah
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