Building matplotlib requires linking against libpng and freetype.  The
error you posted is just saying that libpng can't be found.  Building
matplotlib correctly on osx and windows isn't for the feint of heart.
Have you tried the pre-built osx binaries available for download on
sourceforge?

Charlie

On 10/9/06, R. Padraic Springuel <[EMAIL PROTECTED]> wrote:
> I'm in the process of migrating from Windows to Mac OS X and doing my
> first round of installations from source code in the process.  In trying
> to install matplotlib I get the following error:
>
> /usr/bin/ld: for architecture i386
> /usr/bin/ld: can't locate file for: -lpng
> collect2: ld returned 1 exit status
> /usr/bin/ld: for architecture ppc
> /usr/bin/ld: can't locate file for: -lpng
> collect2: ld returned 1 exit status
> lipo: can't open input file: /var/tmp//ccG7JjGi.out (No such file or
> directory)
> /usr/bin/ld: for architecture i386
> /usr/bin/ld: can't locate file for: -lpng
> collect2: ld returned 1 exit status
> /usr/bin/ld: for architecture ppc
> /usr/bin/ld: can't locate file for: -lpng
> collect2: ld returned 1 exit status
> lipo: can't open input file: /var/tmp//ccG7JjGi.out (No such file or
> directory)
> error: Command "g++ -arch i386 -arch ppc -isysroot
> /Developer/SDKs/MacOSX10.4u.sdk -g -bundle -undefined dynamic_lookup
> build/temp.macosx-10.3-fat-2.5/src/_tkagg.o
> build/temp.macosx-10.3-fat-2.5/CXX/cxx_extensions.o
> build/temp.macosx-10.3-fat-2.5/CXX/cxxsupport.o
> build/temp.macosx-10.3-fat-2.5/CXX/IndirectPythonInterface.o
> build/temp.macosx-10.3-fat-2.5/CXX/cxxextensions.o -L/usr/lib -L/usr/lib
> -lpng -lz -lstdc++ -lm -lfreetype -lz -lstdc++ -lm -o
> build/lib.macosx-10.3-fat-2.5/matplotlib/backends/_tkagg.so -framework
> Tcl -framework Tk" failed with exit status 1
>
> Can anyone tell this novice Mac installer what this means and how to go
> about fixing it?
> --
>
> R. Padraic Springuel
> Teaching Assistant
> Department of Physics and Astronomy
> University of Maine
> Bennett 309
> Office Hours: Wednesday 2-3pm
>
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