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There's a sample Makefile.gcc for pngcrush, which you can use
by typing
make -f Makefile.gcc
However, all you should need to do is enter the pngcrush-n.n.n
directory and type
cc -O -o pngcrush *.c -lm
cp pngcrush /usr/local/bin # or wherever you want
You might want to create your own Makefile if you are planning to do
something more complicated, like loading with your system's shared
libraries for libpng and zlib.
Here's a command for compiling on SGI IRIX:
cc -n32 -fullwarn -O2 -IPA:plimit=256 -OPT:Olimit=0 -o pngcrush *.c -lm
cp pngcrush /usr/local/bin
On a PC with DJGCC, you can type
gcc -O3 -Wall -funroll-loops -o pngcrush *.c
copy /B pmodstub.exe + pngcrush pngcrush.exe
then put pngcrush.exe wherever you want.