Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -1598,11 +1598,11 @@
 
 # Install the SQLite TCL extension in a way that is appropriate for $TCLSH_CMD
 # to find it.
 #
 tclextension-install:	tclsqlite3.c
-	$(TCLSH_CMD) $(TOP)/tool/buildtclext.tcl --cc "$(CC)" $(CFLAGS) $(OPT_FEATURE_FLAGS) $(OPTS)
+	$(TCLSH_CMD) $(TOP)/tool/buildtclext.tcl --destdir "$(DESTDIR)" --cc "$(CC)" $(CFLAGS) $(OPT_FEATURE_FLAGS) $(OPTS)
 
 # Install the SQLite TCL extension that is used by $TCLSH_CMD
 #
 tclextension-uninstall: 
 	$(TCLSH_CMD) $(TOP)/tool/buildtclext.tcl --uninstall

Index: tool/buildtclext.tcl
==================================================================
--- tool/buildtclext.tcl
+++ tool/buildtclext.tcl
@@ -13,10 +13,11 @@
    --build-only         Only build the extension, don't install it
    --cc COMPILER        Build using this compiler
    --info               Show info on existing SQLite TCL extension installs
    --install-only       Install an extension previously build
    --uninstall          Uninstall the extension
+   --destdir DIR        Installation root (used by "make install DESTDIR=...")
 
 Other options are retained and passed through into the compiler.}
 
 
 set build 1
@@ -23,10 +24,11 @@
 set install 1
 set uninstall 0
 set infoonly 0
 set CC {}
 set OPTS {}
+set DESTDIR ""; # --destdir "$(DESTDIR)"
 for {set ii 0} {$ii<[llength $argv]} {incr ii} {
   set a0 [lindex $argv $ii]
   if {$a0=="--install-only"} {
     set build 0
   } elseif {$a0=="--build-only"} {
@@ -40,10 +42,13 @@
     set install 0
     set infoonly 1
   } elseif {$a0=="--cc" && $ii+1<[llength $argv]} {
     incr ii
     set CC [lindex $argv $ii]
+  } elseif {$a0=="--destdir" && $ii+1<[llength $argv]} {
+    incr ii
+    set DESTDIR [lindex $argv $ii]
   } elseif {[string match -* $a0]} {
     append OPTS " $a0"
   } else {
     puts stderr "Unknown option: \"$a0\"\n"
     puts stderr $help
@@ -243,12 +248,12 @@
 }
 
 
 if {$install} {
   # Install the extension
-  set DEST2 $DEST/sqlite$VERSION
+  set DEST2 ${DESTDIR}$DEST/sqlite$VERSION
   file mkdir $DEST2
   puts "installing $DEST2/pkgIndex.tcl"
   file copy -force pkgIndex.tcl $DEST2
   puts "installing $DEST2/$OUT"
   file copy -force $OUT $DEST2
 }