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diff -up thunderbird-68.1.1/build/autoconf/icu.m4.icu thunderbird-68.1.1/build/autoconf/icu.m4
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--- thunderbird-68.1.1/build/autoconf/icu.m4.icu	2019-10-04 09:48:47.337041046 +0200
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+++ thunderbird-68.1.1/build/autoconf/icu.m4	2019-10-04 09:52:32.046670353 +0200
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@@ -78,7 +78,7 @@ if test -n "$USE_ICU"; then
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     # TODO: the l is actually endian-dependent
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     # We could make this set as 'l' or 'b' for little or big, respectively,
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     # but we'd need to check in a big-endian version of the file.
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-    ICU_DATA_FILE="icudt${version}l.dat"
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+    ICU_DATA_FILE="icudt${version}b.dat"
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 fi
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 AC_SUBST(MOZ_ICU_VERSION)