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diff -up firefox-61.0/build/autoconf/icu.m4.icu firefox-61.0/build/autoconf/icu.m4
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--- firefox-61.0/build/autoconf/icu.m4.icu	2018-06-20 09:03:17.957565445 +0200
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+++ firefox-61.0/build/autoconf/icu.m4	2018-06-20 09:08:28.159403451 +0200
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@@ -77,7 +77,7 @@ 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)