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Macro: AC_CONFIG_SUBDIRS (dir …)

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if test "$package_foo_enabled" = yes; then
  $my_subdirs="$my_subdirs foo"
fi
AC_CONFIG_SUBDIRS($my_subdirs)

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if test "$package_foo_enabled" = yes; then
  AC_CONFIG_SUBDIRS(foo)
fi

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if test -d $srcdir/foo; then
  AC_CONFIG_SUBDIRS(foo)
fi

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