SpiderMonkey

download source from http://ftp.mozilla.org/pub/mozilla.org/js/
extract and change to js/src/
build with this (BUILD_OPT=1 forces a non-debug, optimized build)
```
make -f Makefile.ref BUILD_OPT=1
```
copy header file to fix build for mediatomb
```
cp Darwin_OPT.OBJ/jsautocfg.h ../
```

manually install the libraries

sudo cp js/src/Darwin_DBG.OBJ/libjs.* /usr/local/lib/

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