taken from debian vdr repo
this will fix
https://bugs.gentoo.org/703994

Reviewed-by: Joerg Bornkessel <hd_brummy@gentoo.org> ( 2020 Jan 05 )
Index: b/DisplayChannel.c
===================================================================
--- a/DisplayChannel.c
+++ b/DisplayChannel.c
@@ -724,7 +724,7 @@
       }
       else {
          time_t t = time(NULL);
-         int seen = max(0, min(y9 - y6a - 1, int((y9 - y6a) * double(t - Present->StartTime()) / Present->Duration())));
+         int seen = std::max(0, std::min(y9 - y6a - 1, int((y9 - y6a) * double(t - Present->StartTime()) / Present->Duration())));
          osd->DrawRectangle(x4 + Gap, y6a + seen, x4 + Gap + ScrollWidth - 1, y9 - 1, Theme.Color(clrChannelTimebarRest));
          osd->DrawRectangle(x4 + Gap, y6a, x4 + Gap + ScrollWidth - 1, y6a + seen - 1, Theme.Color(clrChannelTimebarSeen));
          changed = true;