<xsd:element name="Win32">
                    <xsd:complexType>
                      <xsd:attribute name="Compiler" type="xsd:string" use="optional" default="mingw32-gcc-sjlj"/>
                      <xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
                      <xsd:attribute name="Linker" type="xsd:string" use="optional" default="mingw32-g++-sjlj"/>
                      <xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>
                    </xsd:complexType>
                  </xsd:element>