PyMOL Compilation Workarounds

Workarounds for ext-0.51 compiled under recent Linux distributions.

The external depencies distribution ext-0.51 is showing its age and fails under recent versions of linux.

Problem: Upon attempting to run ./pymol.com, you get:

ImportError: ..../pymol/ext/lib/libpython1.5.so: undefined symbol: stat

This is being caused by a obsolete shared object hack.

Workaround: Get rid of the shared python library object in ext, and recompile PyMOL.

```
cd (into your pymol directory)
```
```
cd ext/lib
```
```
rm libpython1.5.so
```
```
cp python1.5/config/libpython1.5.a .
```
```
cd (into your pymol directory)
```
```
make clean
```
```
make
```

./pymol.com should now work

Problem:An incompatiable copy of libpng in your system libraries will prevent saving of PNG files (RedHat 7.x+). To resolve this, remove libpng from ext and recompile PyMOL.

```
cd (into your pymol directory)
```
```
cd ext/lib
```
```
rm libpng.a
```
```
cd ../include
```
```
rm png.h
```
```
cd (into your pymol directory)
```
```
make clean
```
```
make
```

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Workarounds for ext-0.51 compiled under recent Linux distributions.

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