PREFERRED_PROVIDER_glibc-thread-db = "external-poky-toolchain"
PREFERRED_PROVIDER_virtual/linux-libc-headers = "external-poky-toolchain"
-TARGET_CPPFLAGS_prepend = " -isystem${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/include "
-TARGET_LDFLAGS_prepend = " -L${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/lib -Wl,-rpath-link,${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/lib "
+TARGET_CPPFLAGS_prepend = " -isystem${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/include --sysroot=${STAGING_DIR_HOST} "
+TARGET_LDFLAGS_prepend = " -L${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/lib -Wl,-rpath-link,${EXTERNAL_TOOLCHAIN}/${TARGET_SYS}/lib --sysroot=${STAGING_DIR_HOST} "
+TARGET_CFLAGS = "${TARGET_CPPFLAGS} ${SELECTED_OPTIMIZATION}"
+