Теперь другая ошибка:

/usr/local/llvm39/bin/clang -Wno-error=varargs -c -O2 -pipe -fno-strict-aliasing   -nostdinc  -I. -I/usr/src/sys -I/usr/src/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -MD  -MF.depend.ppb_1284.o -MTppb_1284.o -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables -ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__  -Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas  -Wno-error-tautological-compare -Wno-error-empty-body  -Wno-error-parentheses-equality -Wno-error-unused-function  -Wno-error-pointer-sign -Wno-error-shift-negative-value  -mno-aes -mno-avx  -std=iso9899:1999 -Werror  /usr/src/sys/dev/ppbus/ppb_1284.c
/usr/src/sys/dev/ppbus/ppb_1284.c:296:46: error: implicit conversion from 'int'
      to 'char' changes value from 144 to -112 [-Werror,-Wconstant-conversion]
        if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) {
                     ~~~~~~~~~~~~~~~~~~      ~~~~~~~^~~~~~~
/usr/src/sys/dev/ppbus/ppb_1284.c:785:48: error: implicit conversion from 'int'
      to 'char' changes value from 240 to -16 [-Werror,-Wconstant-conversion]
                if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY,
                    ~~~~~~~~~~~~      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
/usr/src/sys/dev/ppbus/ppb_1284.c:786:29: error: implicit conversion from 'int'
      to 'char' changes value from 240 to -16 [-Werror,-Wconstant-conversion]
                                        nACK | SELECT | PERROR | nBUSY)) {
                                        ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
/usr/src/sys/dev/ppbus/ppb_1284.c:841:37: error: implicit conversion from 'int'
      to 'char' changes value from 200 to -56 [-Werror,-Wconstant-conversion]
        if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) {
            ~~~~~~~~~~~~      ~~~~~~~~~~~~~^~~~~~~~
4 errors generated.
*** Error code 1

Stop.