[plt-scheme] unable to parse png

Doug Orleans writes:
 > After building the latest SVN version on Debian GNU/Linux, running
 > help-desk gives me the following error and then exits:
 > 
 > include-bitmap: unable to parse image, originated from: /usr/local/lib/plt/collects/icons/turn-down.png
 > 
 >  === context ===
 > /usr/local/lib/plt/collects/mrlib/include-bitmap.ss:50:20

For the record, I just did an SVN update and this problem has gone
away.  Thanks!

--dougorleans at gmail.com