<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>I haven't seen a build error like this before, but the important part of the error message is here:</div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word"><div style="word-wrap:break-word">/Users/clementj/<wbr>DeveloppementLogiciel/Sources/<wbr>VTK-8.1.0/GUISupport/Qt/<wbr>QVTKInteractor.h:44:30:<br>error: variable has<br>     incomplete type 'class VTKGUISUPPORTQT_EXPORT'<br>class VTKGUISUPPORTQT_EXPORT QVTKInteractor : public vtkRenderWindowInteractor</div></div></blockquote><div><br></div><div>The error indicates that the <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">VTKGUISUPPORTQT_EXPORT macro is not defined.</span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">It should be defined in the </span>header GUISupport/Qt/vtkGUISupportQtModule.h (in the build tree).</div><div>Can you check your build to make sure that this header exists, and that it defines the macro?</div><div>This header is generated by cmake, so the best thing is to delete the header, and</div><div>then re-run cmake so that the header will be regenerated.</div><div><br></div><div> - David</div></div></div></div>