Hi There are some weird settings in the Loch Makefile for the VTK variables. It seems that VTKPATH is used to mean VTKINCLUDEPATH, but also for VTKLIBPATH, which causes problems. Here is a better version (only for target Debian) Best, Martin # PLATFORM DEBIAN CXX = c++ CC = gcc POBJECTS = lxR2P.o VTKPATH = /usr/local VTKINCLUDEPATH = $(VTKPATH)/include/vtk-5.2 VTKLIBPATH = $(VTKPATH)/lib/vtk-5.2 VTKLIBS = -lvtkHybrid -lvtkImaging -lvtkIO -lvtkGraphics -lvtkFiltering -lvtkCommon -lfreetype CXXPFLAGS = -DLXLINUX $(shell wx-config --cxxflags) -Wno-deprecated $(shell freetype-config --cflags) -I$(VTKINCLUDEPATH) CCPFLAGS = -DLXLINUX $(shell wx-config --cflags) LXLIBDIR = linux PLIBS = $(shell wx-config --libs --gl-libs) -L$(VTKLIBPATH) $(VTKLIBS) -lGLU -lpthread -lz LXPLATFORM = LINUX