I try to install supermon-1.4-sc2003 and get the following message while trying to create the kernel module ( second step of the installation )

% make LINUX=/usr/src/linux
gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -D__KERNEL__ -DMODULE -I. -I/usr/src/linux/include -c supermon_proc.c
supermon_proc.c: In function `supermon_convert_value':
supermon_proc.c:389: `kstat' undeclared (first use in this function)
supermon_proc.c:389: (Each undeclared identifier is reported only once
supermon_proc.c:389: for each function it appears in.)
supermon_proc.c:410: warning: too many arguments for format
make: *** [supermon_proc.o] Error 1

Please help me