From:	Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Compiling graphics executables, png.h
Date:	Sat, 11 Mar 2000 23:06:55 +0000
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"David" <david AT coneySpamdale DOT freeserve DOT co DOT uk> wrote:

> hi C/++ gurus,
> I downloaded an excellent set to articles on graphics (mainly h13 stuff)
> from flipcode (www.flipcode.com/demomaking). All the articles come with
> source code that loads .png files and puts them through filters etc... well,
> in the code, the djgpp arguments it lists to compile are:
> gcc *.cpp -s -O2 -o fire.exe -lstdcxx -lpng -lz

If you use gpp then you won't need -lstdcxx.

> First I got an error about not having png.h so I went off and downloaded
> that and loads of other .h files it needed, but even now it fails wit the
> error:
> "c:/djgpp/bin/ld.exe: cannot open -lpng: No such file or directory <ENOENT>
> collect2: ld returned 1 exit status"

It is not enough to just #include the library headers in your code.
You need the actual libraries compiled and installed.  These will be
the files libpng.a and libz.a, but they *must* be compiled for DJGPP.

You need to go to the homepages of these libraries and download the
complete library packages for libpng and libz, compile the libraries
using the supplied makefiles and install them into the DJGPP tree.  

This may sound daunting but actually it should be fairly painless.
AFAIK these packages will compile under DJGPP out of the box.

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