Problem with netpbm missing libppm.so?

[Stephen Moore]

netpbm no longer provides libppm.so I am not sure if this is intended or 
not.

I have a program - subtitleripper - which depends on this library and 
the code in question will not build

[stephen at paris stephen]$ cd subtitleripper
[stephen at paris subtitleripper]$ make
Linking subtitle2pgm
/usr/bin/ld: cannot find -lppm
collect2: ld returned 1 exit status
make: *** [subtitle2pgm] Error 1

I am not sure whether to bugzilla it as I don't know if it is a problem 
with netpbm or subtitleripper. Advice on which is the problem would be 
appreciated

cheers