# Build Configuration

Please be aware that this page doesn't reflect all the options used to build Tor Browser Nightly.

## Source

Built from https://gitlab.torproject.org/tpo/applications/tor-browser/-/commit/c9fe25948566948e28291da1887196559e5a3131

## Build platform

target
x86_64-pc-linux-gnu

## Build tools

Compiler | Version | Compiler flags
--- | --- | ---
/var/tmp/dist/clang-linux/bin/clang --gcc-toolchain=/var/tmp/dist/gcc | 20.1.8 | -pthread -ffunction-sections -fdata-sections -fno-math-errno -fPIC
/var/tmp/dist/clang-linux/bin/clang++ --gcc-toolchain=/var/tmp/dist/gcc -std=gnu++20 | 20.1.8 | -fno-rtti -pthread -fno-sized-deallocation -fno-aligned-new -ffunction-sections -fdata-sections -fno-math-errno -fno-exceptions -fPIC -gdwarf-4 -O2 -fomit-frame-pointer -funwind-tables
/var/tmp/dist/rust/bin/rustc | 1.90.0 |

## Configure options

MOZILLA_OFFICIAL=1 --enable-update-channel=nightly 'LDFLAGS=-Wl,-z,relro -Wl,-z,now' 'CC=clang --gcc-toolchain=/var/tmp/dist/gcc' 'CXX=clang++ --gcc-toolchain=/var/tmp/dist/gcc' 'HOST_CC=clang --gcc-toolchain=/var/tmp/dist/gcc' 'HOST_CXX=clang++ --gcc-toolchain=/var/tmp/dist/gcc' --enable-linker=lld --enable-lto=cross MOZ_SOURCE_REPO=https://gitlab.torproject.org/tpo/applications/tor-browser MOZ_SOURCE_CHANGESET=c9fe25948566948e28291da1887196559e5a3131 --with-distribution-id=org.torproject BINDGEN_CFLAGS=--gcc-toolchain=/var/tmp/dist/gcc --enable-js-shell --enable-rust-simd --disable-eme MOZ_TELEMETRY_REPORTING= --disable-webrtc --enable-proxy-bypass-protection WASI_SYSROOT=/var/tmp/dist/wasi-sysroot --disable-backgroundtasks MAR_CHANNEL_ID=torbrowser-torproject-nightly ACCEPTED_MAR_CHANNEL_IDS=torbrowser-torproject-nightly --enable-base-browser-update --with-updater-url=https://nightlies.tbb.torproject.org/nightly-updates/updates/nightly-linux-x86_64 --with-branding=browser/branding/tb-nightly 'MOZ_APP_REMOTINGNAME=Tor Browser Nightly' --disable-crashreporter --disable-parental-controls --disable-system-policies --disable-system-preferences --disable-legacy-profile-creation --disable-install-strip --with-relative-data-dir=TorBrowser/Data/Browser --with-base-browser-version=tbb-nightly.2026.04.20