Testing issue with ubuntu 20.04

[haiguang-wang]

After manually downloading the gtest release-1.8.0.zip, I use sudo -E make build the library. However, When I run with the "make test", some error happened, the first error is as follows:

VirtualBox:~/ABE/openabe/openabe-master$ make test
(cd src && ./test_libopenabe) || exit 1
libopenabe v1.7 test utility.

[==========] Running 46 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 46 tests from libopenabe
[ RUN ] libopenabe.PolicyTreeAndAttributeListParser
Driver::error string stream:1.12-13: syntax error, unexpected OR, expecting end of file
Check if isEqual throws an error correctly

There are a number of other errors in the testing output.