... And the command line counterpart of 'Yeast2' :
# zypper re <package>
see 'man zypper'
Packages installed with # 'make install' :
'make uninstall' from the source directory, if available.
Keep a record of the install by 'copy / paste' the text
from the 'make install' shell to a text file or use a
tool like checkinstall to create an rpm package, which
can be removed with # 'zypper re'
An extra PATH or an LD_LIBRARY_PATH entry does no harm,
if the directory in question doesn't exist any more.
Unset with care if at all, ref. @micxz, post # 2.