How to cross compile use sdk

Hello, all:
Recently i download the latest mono source from this link,and support building to mips32.
and i'm use the follow commands to cross compile the mono runtime:

STAGING_DIR=/home/jerry/source/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16
export STAGING_DIR
PATH=$PATH:/home/jerry/source/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin
export PATH

./configure --prefix=/home/jerry/mono_lib_install CC=/home/jerry/source/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin/mipsel-openwrt-linux-musl-gcc CXX=/home/jerry/source/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin/mipsel-openwrt-linux-musl-g++ --build=x86_64-unknown-linux-gnu --host=mips-linux-gnu --enable-minimal=profiler,debug,logging,soft_debug --without-mcs-docs --target=mips-linux-gnu --with-moonlight=no --with-tls=pthread --with-sigaltstack=no --with-profile4=yes --with-profile4_5=yes CXXFLAGS="-mips32r2 -march=24kf -mtune=24kf -EL" CFLAGS="-mips32r2 -march=24kf -mtune=24kf -EL"

when i use make V=99,it shows that:
In file included from ./include/private/gc_priv.h:95:0,
from ./include/private/pthread_support.h:4,
from pthread_stop_world.c:1:
./include/private/gc_locks.h:302:27: fatal error: sys/tas.h: No such file or directory
compilation terminated.

How can i solve this issue?
Thanks.