You will have to use the lirc_i2c kernel module.

Now enter 'make' and 'make install' to compile and install the package.

make  all-recursive
make[1]: Entering directory `/tmp/lirc-0.8.0'
Making all in drivers
make[2]: Entering directory `/tmp/lirc-0.8.0/drivers'
Making all in lirc_dev
make[3]: Entering directory `/tmp/lirc-0.8.0/drivers/lirc_dev'
mv Makefile Makefile.automake
cp ../Makefile.kernel Makefile
make -C /lib/modules/2.6.18/build/ SUBDIRS=/tmp/lirc-0.8.0/drivers/lirc_dev modules \
                KBUILD_VERBOSE=1
make[4]: Entering directory `/usr/src/linux-2.6.18'
test -e include/linux/autoconf.h -a -e include/config/auto.conf || (            \
        echo;                                                           \
        echo "  ERROR: Kernel configuration is invalid.";               \
        echo "         include/linux/autoconf.h or include/config/auto.conf are missing.";      \
        echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \
        echo;                                                           \
        /bin/false)
mkdir -p /tmp/lirc-0.8.0/drivers/lirc_dev/.tmp_versions
rm -f /tmp/lirc-0.8.0/drivers/lirc_dev/.tmp_versions/*
make -f scripts/Makefile.build obj=/tmp/lirc-0.8.0/drivers/lirc_dev
  gcc -m32 -Wp,-MD,/tmp/lirc-0.8.0/drivers/lirc_dev/.lirc_dev.o.d  -nostdinc -isystem /usr/lib/gcc/i486-slackware-linux/3.4.6/include -D__KERNEL__ -Iinclude  -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -O2 -pipe -msoft-float -mpreferred-stack-boundary=2 -fno-unit-at-a-time -march=athlon -mregparm=3 -ffreestanding -Iinclude/asm-i386/mach-default -fomit-frame-pointer  -Wdeclaration-after-statement  -DIRCTL_DEV_MAJOR=61 -DEXPORT_SYMTAB -DHAVE_CONFIG_H -I. -I. -I../.. -I/tmp/lirc-0.8.0/drivers/lirc_dev/../.. -I/lib/modules/2.6.18/build//include/  -DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(lirc_dev)"  -D"KBUILD_MODNAME=KBUILD_STR(lirc_dev)" -c -o /tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.o /tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c
/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c:54:35: linux/devfs_fs_kernel.h: No such file or directory
/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c: In function `cleanup':
/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c:132: warning: implicit declaration of function `devfs_remove'
/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c: In function `lirc_register_plugin':
/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.c:381: warning: implicit declaration of function `devfs_mk_cdev'
make[5]: *** [/tmp/lirc-0.8.0/drivers/lirc_dev/lirc_dev.o] Error 1
make[4]: *** [_module_/tmp/lirc-0.8.0/drivers/lirc_dev] Error 2
make[4]: Leaving directory `/usr/src/linux-2.6.18'
make[3]: *** [lirc_dev.o] Error 2
make[3]: Leaving directory `/tmp/lirc-0.8.0/drivers/lirc_dev'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/tmp/lirc-0.8.0/drivers'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/tmp/lirc-0.8.0'
make: *** [all] Error 2
Making install in drivers
make[1]: Entering directory `/tmp/lirc-0.8.0/drivers'
Making install in lirc_dev
make[2]: Entering directory `/tmp/lirc-0.8.0/drivers/lirc_dev'
make[2]: *** No rule to make target `install'.  Stop.
make[2]: Leaving directory `/tmp/lirc-0.8.0/drivers/lirc_dev'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/tmp/lirc-0.8.0/drivers'
make: *** [install-recursive] Error 1