troubles compiling.

[whitty reeve <whitty reeve com>]

I'm having troubles compiling .94, The only thing i could figure was, i didn't 
have libpng, how ever, i installed that, and i still get problems. In file, 
export_png.o there are a whole bunch of undefined references to several 
different functions. Here is a the original error message from the first of 
them:
dia-0.94/app/export_png.c:138: undefined reference to 
`png_create_write_struct'

This happens to each one of these:
png_create_info_struct
png_destroy_write_struct
png_init_io
png_set_IHDR
png_set_sBIT
png_set_pHYs
png_write_info
png_set_shift
png_set_packaging
png_write_rows
png_write_end
png_destroy_write_struct

Could somebody please point me in some direction?

I had this same problem with cvs before .94 was released, but i didn't think 
much of it. 

Whitty.