-Win7 Business Pack1 64bits : wx-3.1.5, gcc-8.1.0,
I compile at the moment 'r12682':
in 'wxsitemres.cpp:379, 425'
Header = wxsCoder::RebuildCode(Indentation, Header.c_str(), Header.length(), EOL);
The compiler complains that an object is missing from the call  :  'RebuildCode(...)' is private and not 'static'
in 'wxsCoder.h' :
public:
        /** \brief Rebuilding code to support current editor settings */
        static wxString RebuildCode(wxString& BaseIndentation,const wxChar* Code,int CodeLen,wxString& EOL);
private:
allows to compile correctly.
Corrected in r12683 !!*** an other 
in 'wxPdfDocument::PutPatterns():2335' in   'switch (pattern->GetPatternStyle()) it's missing
case wxPDF_PATTERNSTYLE_NONE :
          break;
 case wxPDF_PATTERNSTYLE_TEMPLATE:
          break;
case wxPDF_PATTERNSTYLE_IMAGE:
          break;