on Linux turn-off the -Wl,--no-undefined linker flag when libPythia6 
is not provided at configure time.


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Add comment to clarify early return / "impossible" case.


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in libPythia6 (generates unresolved symbol error).


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- Added the following packages: oracle, mysql, odbc, gviz, fftw, pythia6,
  pythia8, unuran, table
- Changed the default values for the build options depending on platform
  such that they display correctly with cmake-gui or ccmake
- Fixed mathmore build on Windows
- Make histfactory depending on xml option


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To make an out of source build do, assuming the source is in ~/root:
   mkdir ~/root-x8664
   cd ~/root-x8664
   ~/root/configure
   make
This is convenient to build e.g. 32 and 64-bit version from one source, but
also needed for cross-compilation, where it is now possible to build in
a special directory only the compile time tools, like rootcint for the
host architecture while the binary is build for the remote architecture
(like iOS).


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  void TPythia6::Pygive(const char *param)


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- Solves unresolved external (on Windows)


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eg, g4root, pythia6, pythia8, vmc


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