Error: Array Type Has Incomplete Element Type

When i try to install BotNET 1.0 on my dedicated, i got this error :

root@leet [~/botnet/BotNET-1.0]# . install.sh
Compiling source code . . .
In file included from src/main.c:9:
src/../include/bot.h:43: error: array type has incomplete element type
src/../include/bot.h:57: error: array type has incomplete element type
src/../include/bot.h:89: error: array type has incomplete element type
src/main.c: In function:
src/main.c:146: error: type of formal parameter 1 is incomplete
Here is my install.sh file:
Code:
#!/bin/bash
# BotNET installation script.
# If this script causes problems, try "make all" instead.
# Usage: . install.sh

cc="/usr/bin/gcc"

echo "Compiling source code . . ."

bot=`$cc src/main.c src/launch.c src/memo.c src/seen.c src/parse.c src/help.c src/log.c src/info.c -o bin/bot -pthread || (echo 1)`
botnet=`$cc src/botserv.c -o bin/botserv || (echo 1)`

if [ "$bot" != "1" ]; then
echo "Installation complete."
echo "Executables will be found in bin/"
else
echo "Errors encountered during compilation!"
fi

My OS is centOs 5.x
Kernel : Linux 2.6.18-53.el5 #1 SMP Mon Nov 12 02:22:48 EST 2007 i686 i686 i386 GNU/Linux
* I have tried all other way to install (make all) and other *