Hi, i just tested your solution, but it hangs when trying to install libxaw7

when I type : apt-get install libxaw7 with root access, I have this error message

"package libxaw7 is not available, but is referred to by another package.
this may mean that the package is missing, has been obsoleted, or is only available from another source.
e: package libxaw7 has no installation candidate"

Do you know what pb is ? and how I can repair it ?
thanks a lot !