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diff -up firefox-68.0/config/makefiles/rust.mk.old firefox-68.0/config/makefiles/rust.mk
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--- firefox-68.0/config/makefiles/rust.mk.old	2019-06-05 10:33:34.290128660 +0200
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+++ firefox-68.0/config/makefiles/rust.mk	2019-06-05 10:33:59.835052814 +0200
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@@ -47,7 +47,7 @@ cargo_rustc_flags = $(CARGO_RUSTCFLAGS)
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 ifndef DEVELOPER_OPTIONS
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 ifndef MOZ_DEBUG_RUST
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 # Enable link-time optimization for release builds.
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-cargo_rustc_flags += -C lto
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+#cargo_rustc_flags += -C lto
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 endif
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 endif
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