SAGE_SPKG_CONFIGURE([appdirs], [
sage_spkg_install_appdirs=yes
], [dnl REQUIRED-CHECK
AC_REQUIRE([SAGE_SPKG_CONFIGURE_VIRTUALENV])
dnl only needed as a dependency of virtualenv.
AS_VAR_SET([SPKG_REQUIRE], [$sage_spkg_install_virtualenv])
])
