Index: apps/build.tcl
===================================================================
diff -u -rdd6a0a0b50197df4c8b442b7c9f43ec4410f2b8f -r00ac4c06c0bd3ffbf16c098d703040974f439ae0
--- apps/build.tcl	(.../build.tcl)	(revision dd6a0a0b50197df4c8b442b7c9f43ec4410f2b8f)
+++ apps/build.tcl	(.../build.tcl)	(revision 00ac4c06c0bd3ffbf16c098d703040974f439ae0)
@@ -32,29 +32,36 @@
       ::http::geturl $URL \
           -binary true \
           -channel $fh
+      close $fh
+      # seek $fh 0
+      # zlib push gunzip $fh
+      # ::tar::untar $fh -chan
+
+      exec >@stdout 2>@stderr bash -lc "7z x $tarball -so | 7z x -aoa -si -ttar -o tcl"
       
-      seek $fh 0
-      zlib push gunzip $fh
-      ::tar::untar $fh -chan
-      
     } on error {e opts} {
       file delete -force tcl
       return -options $opts $e
     } finally {
-      close $fh
+      catch {close $fh}
       file delete -force $tarball
     }
+
+
+    
   } else {
 
     # fall back to using curl
     exec >@stdout 2>@stderr bash -lc "curl -L -k -o $tarball $URL"
 
-    set fh [open $tarball rb]
+    # set fh [open $tarball rb]
     try {
-      zlib push gunzip $fh
-      ::tar::untar $fh -chan
+      # zlib push gunzip $fh
+      # ::tar::untar $fh -chan
+      exec >@stdout 2>@stderr bash -lc "7z x $tarball -so | 7z x -aoa -si -ttar -o tcl"
+      
     } finally {
-      close $fh
+      # close $fh
       file delete -force $tarball
     }
   }
Index: appveyor.yml
===================================================================
diff -u -ra0e21882d0c0039a2059bf3b4eef202ae6275ace -r00ac4c06c0bd3ffbf16c098d703040974f439ae0
--- appveyor.yml	(.../appveyor.yml)	(revision a0e21882d0c0039a2059bf3b4eef202ae6275ace)
+++ appveyor.yml	(.../appveyor.yml)	(revision 00ac4c06c0bd3ffbf16c098d703040974f439ae0)
@@ -61,7 +61,6 @@
   - if not exist "%MINGW_ARCHIVE%" appveyor DownloadFile "%MINGW_URL%" -FileName "%MINGW_ARCHIVE%"
   - 7z x -y "%MINGW_ARCHIVE%" > nul
   - if not exist "%TCLKIT%" appveyor DownloadFile "%TCLKIT_URL%" -FileName "%TCLKIT%"
-  - echo PWD=%CD%
   - dir %MINGW_DIR%
 
 build_script:
@@ -75,6 +74,7 @@
   - if "%TOOLCHAIN%" == "autoconf-tea" bash -lc "cd && echo \"export PATH=/c/projects/nsf-2ylk0/mingw64/bin:\$PATH; export MSYSTEM=MINGW64; export MINGW_PREFIX=/c; alias make='/c/msys64/usr/bin/make'; shopt -s expand_aliases; \" >> .profile"
   - if "%TOOLCHAIN%" == "autoconf-tea" bash -lc "sh --version"
   - if "%TOOLCHAIN%" == "autoconf-tea" bash -lc "make --version"
+  - dir %CD%
   - tclkit.exe apps/build.tcl %CD% %APPVEYOR_BUILD_FOLDER% %TCLTAG% %TOOLCHAIN%
 
 on_failure: