Cross compiling needs host and build settings. configure no longer
creates a broken PYTHON_FOR_BUILD variable when --build is missing.
diff --git a/configure.ac b/configure.ac
index 2738703..ef58a9f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,6 +67,8 @@
AC_MSG_RESULT($interp)
PYTHON_FOR_BUILD="_PYTHON_PROJECT_BASE=$srcdir"' _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(srcdir)/Lib:$(srcdir)/Lib/plat-$(MACHDEP) '$interp
fi
+elif test "$cross_compiling" = maybe; then
+ AC_MSG_ERROR([Cross compiling required --host=HOST-TUPLE and --build=ARCH])
else
PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E'
fi