diff -ur bacisrc.orig/interp/Makefile bacisrc/interp/Makefile
--- bacisrc.orig/interp/Makefile	2003-05-14 19:30:19.000000000 +0200
+++ bacisrc/interp/Makefile	2004-08-10 21:46:57.959481592 +0200
@@ -65,7 +65,7 @@
 Linuxgui:
 	make "DEFINES=-DLinux -DTCL" "LLIBS=$(LTCL) $(LTK) -lX11 -lm" \
       "INCDIRS= -I$(INCDIR) -I$(TCLINCDIR) -I$(TKINCDIR)" \
-      "LDFLAGS= -L/usr/lib -L/usr/local/lib -L/usr/X11R6/lib" \
+      "LDFLAGS= -L/usr/lib64 -L/usr/local/lib -L/usr/X11R6/lib64" \
       guibainterp
 
 SunOSgui: