Undefined reference to `__jp2uc_l' during tests

I usually configure newlib with ../../newlib/configure 
--prefix=/usr/local --target=h8300-elf 
--disable-newlib-supplied-syscalls --disable-newlib-mb 
--disable-newlib-iconv --disable-newlib-wide-orient 
--enable-newlib-io-c99-formats.

Then, when I run tests I get the following message:
[...]
Executing on host: h8300-elf-gcc 
/mnt/Works/newlib/newlib/testsuite/newlib.wctype/twctrans.c 
-I/mnt/Works/newlib/newlib/testsuite/include -lm  -o 
/mnt/Works/xcomp/newlib-build/h8300-elf/newlib/testsuite/twctrans.x 
(timeout = 300)
spawn -ignore SIGHUP h8300-elf-gcc 
/mnt/Works/newlib/newlib/testsuite/newlib.wctype/twctrans.c 
-I/mnt/Works/newlib/newlib/testsuite/include -lm -o 
/mnt/Works/xcomp/newlib-build/h8300-elf/newlib/testsuite/twctrans.x
/mnt/Works/xcomp/sysroot/bin/../lib/gcc/h8300-elf/16.0.0/../../../../h8300-elf/bin/ld: 
/mnt/Works/xcomp/sysroot/bin/../lib/gcc/h8300-elf/16.0.0/../../../../h8300-elf/lib/libc.a(libc_a-towctrans_l.o): 
in function `towctrans_l':
/mnt/Works/xcomp/newlib-build/h8300-elf/newlib/../../../../newlib/newlib/libc/ctype/towctrans_l.c:145:(.text+0x185): 
undefined reference to `__jp2uc_l'
/mnt/Works/xcomp/sysroot/bin/../lib/gcc/h8300-elf/16.0.0/../../../../h8300-elf/bin/ld: 
/mnt/Works/xcomp/newlib-build/h8300-elf/newlib/../../../../newlib/newlib/libc/ctype/towctrans_l.c:159:(.text+0x2a3): 
undefined reference to `__uc2jp_l'
collect2: error: ld returned 1 exit status
compiler exited with status 1
FAIL: newlib.wctype/twctrans.c compilation
[...]

_uc2jp_l() is compiled only if _MB_CAPABLE is defined, but _MB_CAPABLE 
is NOT defined because of "--disable-newlib-mb". On the other hand
_uc2jp_l() is called unconditionally from towctrans_l(). That's why the 
linker complains about missing symbol. This is obvious. But I have no 
idea how to fix the issue in an elegant way. Any help would be appreciated.

Regards,

Jan