problems with libiconv into kernel

  Hi all,

    Last night, I has tried to put in my kernel config the libiconv with this
knobs from LINT:

options         CD9660_ICONV
options         MSDOSFS_ICONV
options         UDF_ICONV
options         LIBICONV

but this results int this error:

cc -c -O2 -pipe -fno-strict-aliasing  -std=c99  -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith
-Winline -Wcast-qual  -Wundef -Wno-pointer-sign -fformat-extensions 
-Wmissing-include-dirs -fdiagnostics-show-option 
-Wno-error-tautological-compare -Wno-error-empty-body 
-Wno-error-parentheses-equality  -nostdinc  -I. -I../../..
-I../../../contrib/altq -I../../../contrib/libfdt -D_KERNEL
-DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-omit-frame-pointer
-mno-omit-leaf-frame-pointer -mno-aes -mno-avx -mcmodel=kernel -mno-red-zone
-mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding
-fstack-protector -Werror  ../../../libkern/iconv.c
../../../libkern/iconv.c:39:10: fatal error: 'iconv_converter_if.h' file not
      found
#include "iconv_converter_if.h"
         ^
1 error generated.
*** Error code 1

Stop.
make: stopped in /usr/src/sys/amd64/compile/VALFENDA

What am I doing wrong? My svn version is 255531 

TIA,

Rizzo