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diff -up firefox-63.0/toolkit/moz.configure.disable-elfhack firefox-63.0/toolkit/moz.configure
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--- firefox-63.0/toolkit/moz.configure.disable-elfhack	2018-10-18 13:35:35.870039190 +0200
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+++ firefox-63.0/toolkit/moz.configure	2018-10-18 13:36:41.682515492 +0200
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@@ -1010,7 +1010,7 @@ with only_when('--enable-compile-environ
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                help='Disable elf hacks')
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         set_config('USE_ELF_HACK',
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-                   depends_if('--enable-elf-hack')(lambda _: True))
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+                   depends_if('--enable-elf-hack')(lambda _: False))
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 @depends(check_build_environment)