LIB_DIR is now just 'lib' or 'lib64'
Replaced $(LIB_DIR) with $(TOP)/$(LIB_DIR), use LIB_DIR in install targets.
Patch by Hanno Böck.
diff --git a/configs/linux-alpha b/configs/linux-alpha
index 507c808..d69aabb 100644
--- a/configs/linux-alpha
+++ b/configs/linux-alpha
@@ -12,7 +12,7 @@
 GLUT_CFLAGS = -fexceptions
 
 GL_LIB_DEPS = -L/usr/X11R6/lib -lX11 -lXext -lm -lpthread
-GLUT_LIB_DEPS = -L$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) -L/usr/X11R6/lib -lX11 -lXmu -lXt -lXi -lm
-GLW_LIB_DEPS = -L$(LIB_DIR) -l$(GL_LIB) -L/usr/X11R6/lib -lXt -lX11
-APP_LIB_DEPS = -L$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) -lm
+GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB) -L/usr/X11R6/lib -lX11 -lXmu -lXt -lXi -lm
+GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) -L/usr/X11R6/lib -lXt -lX11
+APP_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) -lm