CMake Shared Library creation error No Version specified

[voraciousCrustacean]

Hello, I am attempting to create some unit tests for some of my legacy Linux applications and needing to use GoogleTest 1.8.1 with CMAKE 2.8.13. I am needing to create some shared library .so objects so that I can like them into my project. However, when I execute the command, CMake -DBUILD_SHARED_LIBRARY=ON I get the following Errors
CAMKE ERROR AT ../../WriteBasicConfigVersionFile.cmake:39 (message): No Version Specified for write_basicConfig_version_file Call Stack (most recent call first .../../CMakePackageConfigHelpers.cmake:152 (write_basic_config_version_File)) googletest/CMakeList.txt:96 (write_basic_package_version_file).

I had previously generated the .so files with version 1.10 using cmake with no issues. However, since I'm needing something more compatible with c++98 I'm attempting to use version 1.8.1.

If anyone can help me determine why I'm getting this error and how I can generate the .so for V1.8.1 I'd be greatly appreciative!