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diff -up firefox-60.0/build/autoconf/icu.m4.icu firefox-60.0/build/autoconf/icu.m4
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--- firefox-60.0/build/autoconf/icu.m4.icu	2018-04-17 15:11:54.100644119 +0200
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+++ firefox-60.0/build/autoconf/icu.m4	2018-04-17 15:12:50.740686636 +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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     MOZ_ICU_DATA_ARCHIVE=
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 fi