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diff -up syncevolution-1.5.1/src/syncevo/icaltz-util.c.libical2 syncevolution-1.5.1/src/syncevo/icaltz-util.c
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--- syncevolution-1.5.1/src/syncevo/icaltz-util.c.libical2	2014-04-28 11:55:52.000000000 +0200
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+++ syncevolution-1.5.1/src/syncevo/icaltz-util.c	2016-01-19 10:04:32.090379654 +0100
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@@ -162,7 +162,7 @@ typedef struct
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 } leap;
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 #ifndef EVOLUTION_ICAL_COMPATIBILITY
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-extern const char *ical_tzid_prefix;
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+const char *ical_tzid_prefix = "/freeassociation.sourceforge.net/";
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 #endif
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 static int