Hello everyone - It has been several years since I went through the pain of compiling Therion. I remember that Loch has always given me trouble. Today I downloaded 5.3.11 and see that nothing has changed. Loch is still failing. Here is the last bits of output I get when running make: ======================= make -C ./loch make[1]: Entering directory `/Installs/therion-5.3.11/loch' c++ -o loch -Wall lxR2P.o lxTR.o lxOGLFT.o lxSetup.o lxRender.o lxWX.o lxImgIO.o lxLRUD.o lxFile.o lxSTree.o lxData.o lxMath.o lxSView.o lxSScene.o lxGUI.o lxGLC.o lxOptDlg.o lxAboutDlg.o img.o -lwx_gtk2u_gl-2.8 -pthread -Wl,- z,relro -lwx_gtk2u_richtext-2.8 -lwx_gtk2u_aui-2.8 -lwx_gtk2u_xrc-2.8 - lwx_gtk2u_qa-2.8 -lwx_gtk2u_html-2.8 -lwx_gtk2u_adv-2.8 -lwx_gtk2u_core-2.8 - lwx_baseu_xml-2.8 -lwx_baseu_net-2.8 -lwx_baseu-2.8 -L/usr/lib/vtk-5.4 - lvtkHybrid -lvtkImaging -lvtkIO -lvtkGraphics -lvtkFiltering -lvtkCommon - lfreetype -lGLU -lpthread -lz -s /usr/bin/ld: cannot find -lvtkHybrid /usr/bin/ld: cannot find -lvtkImaging /usr/bin/ld: cannot find -lvtkIO /usr/bin/ld: cannot find -lvtkGraphics /usr/bin/ld: cannot find -lvtkFiltering /usr/bin/ld: cannot find -lvtkCommon collect2: error: ld returned 1 exit status make[1]: *** [loch] Error 1 make[1]: Leaving directory `/Installs/therion-5.3.11/loch' make: *** [loch/loch] Error 2 ==================== The system is 64-bit Fedora 17. I suspect the problem is in the command line option "-L/usr/lib/vtk-5.4". The system by default does not have this directory. I added a symbolic link to the location of vtk (/usr/include/vtk-5.4) but it made no difference. I have never used Loch. Is there a command line option to tell make to skip Loch? Somehow I got past this with Therion 5.3.6, but I do not remember how. Thanks - Bill Gee