# https://sqlite.org/forum/forumpost/0683a49cb02f31a1
# https://bugs.gentoo.org/942918
# Compiled from https://sqlite.org/forum/forumpost/6fd4ca69e86eafc6, https://www.sqlite.org/src/info/38136b33f9536b63 and https://www.sqlite.org/src/info/2f6e5946cf34e094

--- a/tool/buildtclext.tcl
+++ b/tool/buildtclext.tcl
@@ -140,12 +140,13 @@
   if {[string length $OPTS]>1} {
     append LDFLAGS $OPTS
   }
-  set CMD [subst $cmd]
   if {$TCLMAJOR>8} {
     set OUT libtcl9sqlite$VERSION.$SUFFIX
   } else {
     set OUT libsqlite$VERSION.$SUFFIX
   }
+  set @ $OUT; # workaround for https://sqlite.org/forum/forumpost/6b1af7eb10884373
+  set CMD [subst $cmd]
 }
   
 # Show information about prior installs

From b03592c324a4d066e12c3af945dd510dc28b6d65 Mon Sep 17 00:00:00 2001
From: stephan <stephan@noemail.net>
Date: Sat, 16 Nov 2024 14:33:01 +0000
Subject: [PATCH] Add DESTDIR support to the tclextension-install target, via
 [67a3ca0c013b] and [d1663cf05f7d].

--- a/Makefile.in
+++ b/Makefile.in
@@ -1600,7 +1600,7 @@ tclextension:	tclsqlite3.c
 # 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
 #
+38136b33f9536b63520d3810f397a3b4b5372028b31108806f84fe44bf338425
--- a/tool/buildtclext.tcl
+++ b/tool/buildtclext.tcl
@@ -15,6 +15,7 @@ Options:
    --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.}
 
@@ -25,6 +26,7 @@ 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"} {
@@ -42,6 +44,9 @@ for {set ii 0} {$ii<[llength $argv]} {incr ii} {
   } elseif {$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 {
@@ -245,7 +250,7 @@ package ifneeded sqlite3 $VERSION \\
 
 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

From 375552f224813c7e2fac0e67dd13ecd6ba3a3571 Mon Sep 17 00:00:00 2001
From: stephan <stephan@noemail.net>
Date: Sat, 16 Nov 2024 17:12:17 +0000
Subject: [PATCH] Handle DESTDIR at an earlier phase in buildtclext.tcl to
 account for the is-writable-dir check and to filter out //zipfs: dirs as
 (im)possible installation targets.
--- a/tool/buildtclext.tcl
+++ b/tool/buildtclext.tcl
@@ -198,7 +198,15 @@ if {$install} {
   #
   set DEST {}
   foreach dir $auto_path {
-    if {[file writable $dir]} {
+    if {[string match //*:* $dir]} {
+      # We can't install to //zipfs: paths
+      continue
+    } elseif {"" ne $DESTDIR && ![file writable $DESTDIR]} {
+      continue
+    }
+    set dir ${DESTDIR}$dir
+    if {[file writable $dir] || "" ne $DESTDIR} {
+      # the dir will be created later ^^^^^^^^
       set DEST $dir
       break
     } elseif {[glob -nocomplain $dir/sqlite3*/pkgIndex.tcl]!=""} {
@@ -216,7 +224,7 @@ if {$install} {
     puts "to work around this problem.\n"
     puts "These are the (unwritable) \$auto_path directories:\n"
     foreach dir $auto_path {
-      puts "  *  $dir"
+      puts "  *  ${DESTDIR}$dir"
     }
     exit 1
   }
@@ -250,7 +258,7 @@ package ifneeded sqlite3 $VERSION \\

 if {$install} {
   # Install the extension
-  set DEST2 ${DESTDIR}$DEST/sqlite$VERSION
+  set DEST2 $DEST/sqlite$VERSION
   file mkdir $DEST2
   puts "installing $DEST2/pkgIndex.tcl"
   file copy -force pkgIndex.tcl $DEST2