python: improved cross-compiling avoiding host libs to leak in and getting linker errors

python/python/python.conf

@@ -59,4 +59,10 @@ if atstage cross; then
 	var_append configcache ' ' "ac_cv_file__dev_ptmx=yes"
 	# no /dev/ptc because it is AIX specific
 	var_append configcache ' ' "ac_cv_file__dev_ptc=no"
+
+	# point to the sandbox to avoid host libs to leak in
+	var_insert CFLAGS ' ' "-I$root/usr/include"
+	var_insert LDFLAGS ' ' "-L$root/usr/lib -L$root/lib"
+	var_append configprefix ' ' "CFLAGS=\"$CFLAGS\""
+	var_append configprefix ' ' "LDFLAGS=\"$LDFLAGS\""
 fi