Missing headers in include/android/

run project and get some errors related to android/text

Showing All Errors Only
Undefined symbol: _AndroidTextTextUtils_isEmptyWithJavaLangCharSequence_
Undefined symbol: _AndroidTextTextUtils_joinWithJavaLangCharSequence_withJavaLangIterable_
Undefined symbol: _AndroidUtilLog_dWithNSString_withNSString_

It seems that some folders and headers are missing from the latest code
by using the "make -j8 dist" command, as compared to the j2objc-2.8.zip release.
The missing folders and headers are:

/include/android/os
/include/android/test
/include/android/text
/include/android/util

I'm wondering if you could help me resolve this issue.
Thank you for your help.