Hello, I just gave Dillo another try on Cygwin/X11 and got it working at least partially with cygwin 1.7.9. You need to compile FLTK using Cygwin libraries and X11: ./configure --enable-cygwin --enable-x11 && make install Because the dpis are installed with ".exe" extension (eg hello.dpi.exe) they aren't found by dpid. The extension is added by automake: http://www.gnu.org/s/hello/manual/automake/EXEEXT.html The Makefiles look like this: bookmarks_PROGRAMS = bookmarks.dpi$(EXEEXT) I don't know how to break automake of doing this for the dpis only, so I modified dpid to use .exe-extension on cygwin (see attached patch). After starting the XServer (/usr/bin/XWin -multiwindow) you can run Dillo. Plain browsing with http using proxy and the bookmark & cookie dpis does work. The other dpi currently fail. - hello-dpi shows the dialog and without pressing any button the resultpage (Answer received: Window was closed). After pressing Yes dpid logs "ERROR: [a_Capi_dpi_send_data] No open connection found" - vsource just crashes - file, ftp and https can't connect: Dpi_get_server_port: can't read server port from dpid. ** ERROR **: dpi.c: can't start dpi daemon Looks like the socket implementation of cygwin still has some quirks which can maybe tracked down. Is there any interest to support this target on a source code basis? Thanks and Greets, Stephan