I found more information and a fix, even if I don't fully understand.
..snip..
Description:
When using some X11 programs, eg. xclipboard, xmessage, they throw
a segmentation fault, after sending the message:
Warning: Unable to load any usable ISO8859 font
xclipboard also output this:
Cannot convert string "--courier-medium-r-normal---120-----iso8859-1" to type
FontStruct
It seems the font wasn't on the system, which is strange because I didn't
think I change the base install.
I ran, as per indication of man xlsfonts, to check if font existed:
$ xlsfonts -fn '-*-courier-medium-r-normal--*-120-*-*-*-*-iso8859-1
-adobe-courier-medium-r-normal--12-120-75-75-m-70-iso8859-1
-adobe-courier-medium-r-normal--17-120-100-100-m-0-iso8859-1
-adobe-courier-medium-r-normal--17-120-100-100-m-0-iso8859-1
-adobe-courier-medium-r-normal--17-120-100-100-m-100-iso8859-1
And there it was. For easy testing I changed
/usr/X11R6/share/X11/app-defaults/XClipboard font info to
*Text*Font: -*-courier-*-r-normal--*-120-*-*-*-*-iso8859-1
And it worked!
For a fix, I added to $HOME/.Xresources a catchall for fonts:
*font : spleen-16x32
and is all good.
..snip..
--
Luis Bandarra