diff -Naurp tcl8.4.13.orig/unix/tcl.m4 tcl8.4.13/unix/tcl.m4
--- tcl8.4.13.orig/unix/tcl.m4	2006-12-11 20:01:59.000000000 -0600
+++ tcl8.4.13/unix/tcl.m4	2006-12-11 20:02:42.000000000 -0600
@@ -1340,7 +1340,7 @@ dnl AC_CHECK_TOOL(AR, ar)
 	    #CFLAGS_OPTIMIZE="${CFLAGS_OPTIMIZE} -D__NO_STRING_INLINES -D__NO_MATH_INLINES"
 
 	    if test "$have_dl" = yes; then
-		SHLIB_LD="${CC} -shared"
+		SHLIB_LD="${CC} -shared -Wl,-soname,\${TCL_LIB_FILE}"
 		DL_OBJS="tclLoadDl.o"
 		DL_LIBS="-ldl"
 		LDFLAGS="$LDFLAGS -Wl,--export-dynamic"