one answer: Undefined symbol: WSRegisterXXX lazarus / 38-Networking and Web Programming ---------------------------------------------------------------------- bills · 2013-03-17 22:41 when i new built a web module form and drop a zconnection(one of zeos componet) on it, then built it,  come out many error message such as: Undefined symbol: WSRegisterXXX I delete the new added content of zeos in use section, then the error disapper. ---------------------------------------------------------------------- Martin_fr · 2013-03-17 22:46 You must add the LCL to the package dependencies.  (actually that may happen automatically) You must also in your main program file (lpr) add the unit Interfaces to the the uses clause. However, if Zeos pulls in the LCL (and that is what it looks like, accordingg to the error) you must further more set the widgetset type to "none-gui" (or similar)