Missing double quote in pstopnm script. The problem manifests itself when
invoking the utility without either xsize or ysize.

Diffs of the fix follow:

231c231,232
<           # neither xsize nor ysize was specified; compute them from xmax
and ymax
---
>           # neither xsize nor ysize was specified; compute them from
>           # xmax and ymax
234c235
<           set xres = `(echo "scale=4";echo "if($xres>$yres)$yres";echo
"if($yres>$xres)$xres";echo "if($xres==$yres)$xres")|bc -l`
---
>           set xres = `(echo "scale=4";echo "if($xres>$yres)$yres";echo
"if($yres>$xres)$xres";echo "if($xres==$yres)$xres)|bc -l`