From:	"David" <david AT coneySpamdale DOT freeserve DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Compiling graphics executables, png.h
Date:	Sat, 11 Mar 2000 18:13:15 -0000
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Thanks for clearing that up for me.

Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk> wrote in message
news:h7jlcsst2qjc87noroup37tn3loobvo51e AT 4ax DOT com...
> "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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