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diff -up firefox-68.8.0/intl/icu_sources_data.py.icu-makefile firefox-68.8.0/intl/icu_sources_data.py
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--- firefox-68.8.0/intl/icu_sources_data.py.icu-makefile	2020-05-11 17:00:03.642605718 +0200
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+++ firefox-68.8.0/intl/icu_sources_data.py	2020-05-11 17:00:37.774642749 +0200
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@@ -246,8 +246,7 @@ def update_data_file(topsrcdir):
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     if not try_run(
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             'icu-make',
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             ['make',
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-             '--jobs=%d' % multiprocessing.cpu_count(),
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-             '--output-sync'],
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+             '--jobs=1'],
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             cwd=objdir):
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         return False
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     print('Copying ICU data file...')