clisp 2.37 seems unable to append to files

I had already noted clisp bug 1399709 a few days ago. As nobody reacted I started to think something was wrong with my setup. Then I saw Gary King has the same problem on Mac OS-X. So I think maybe the problem does exist after all :-(.

Note to debian people: this problem is delaying the release of a new clisp version with a fix for the xlibs-dev transition.