The oldest cmake version from maintained repositories (Ubuntu 18.04 LTS) is 3.10, so it was used to test if CMakeLists.txt is correct. With these changes it is possible to build code without cmake errors.
PTF tests are not performed because the C code is not changed.
fixes #91 (not fully, because probably even older version can be used, but this has not been tested)
The oldest cmake version from maintained repositories (Ubuntu 18.04 LTS) is 3.10, so it was used to test if CMakeLists.txt is correct. With these changes it is possible to build code without cmake errors.
PTF tests are not performed because the C code is not changed.
fixes #91 (not fully, because probably even older version can be used, but this has not been tested)