The MC146818 sits on an ISA bus. Since it can not be used
without it, select ISA in the Kconfig.

Fixes: 82f5181777e
Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
 hw/rtc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/rtc/Kconfig b/hw/rtc/Kconfig
index 45daa8d655..3dc2dd6888 100644
--- a/hw/rtc/Kconfig
+++ b/hw/rtc/Kconfig
@@ -17,6 +17,7 @@ config TWL92230
     depends on I2C
 
 config MC146818RTC
+    depends on ISA_BUS
     bool
 
 config SUN4V_RTC
-- 
2.21.0


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