Make it easier to distribute bzip2

scripts/autogen.sh

@@ -51,6 +51,9 @@ if test "$1" = "--build-w32"; then
     fi
     build=`$tsdir/scripts/config.guess`
 
+    [ -z "$w32root" ] && w32root="$HOME/w32root"
+    echo "Using $w32root as standard install directory" >&2
+
     # Locate the cross compiler
     crossbindir=
     for host in i586-mingw32msvc i386-mingw32msvc; do
@@ -92,6 +95,7 @@ if test "$1" = "--build-w32"; then
     [ $DIE = yes ] && exit 1
 
     $tsdir/configure ${conf_CC} --build=${build} --host=${host} \
+                --with-bzip2=${w32root} \
                 ${disable_foo_tests}  $*
     exit $?
 fi