-GL_LIB_DEPS = -lX11 -lXext -lm -lpthread
-OSMESA_LIB_DEPS = -L$(LIB_DIR) -l$(GL_LIB)
-GLU_LIB_DEPS = -L$(LIB_DIR) -l$(GL_LIB) -lm
-GLUT_LIB_DEPS = -L$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) -lX11 -lXmu -lXt -lXi -lm
-GLW_LIB_DEPS = -L$(LIB_DIR) -l$(GL_LIB) -lXt -lX11
-APP_LIB_DEPS = -L$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) -lm
+#EXTRA_LIB_PATH ?=
+GL_LIB_DEPS = $(EXTRA_LIB_PATH) -lX11 -lXext -lm -lpthread
+OSMESA_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB)
+GLU_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) -lm
+GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) $(EXTRA_LIB_PATH) -lX11 -lXmu -lXt -lXi -lm
+GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) $(EXTRA_LIB_PATH) -lXt -lX11
+APP_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) -lm
+
+
+
+# Installation directories (for make install)
+INSTALL_DIR = /usr/local
+DRI_DRIVER_INSTALL_DIR = /usr/X11R6/lib/modules/dri
+
+# Where libGL will look for DRI hardware drivers
+DRI_DRIVER_SEARCH_DIR = $(DRI_DRIVER_INSTALL_DIR)
+