tce-load -i compiletc python3.6-dev icu67-dev autoconf2.13 yasm rust llvm-dev clang

wget https://archive.mozilla.org/pub/firefox/releases/68.11.0esr/source/firefox-68.11.0esr.source.tar.xz

cd firefox-68.11.0

sudo cp /tmp/tcloop/llvm-dev/usr/local/bin/llvm-config /usr/local/bin

sed '21,+4d' -i js/moz.configure

mkdir obj
cd obj

LLVM_OBJDUMP=/bin/false CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ../js/src/configure --prefix=/usr/local --enable-readline --with-intl-api --with-system-zlib --with-system-icu --disable-jemalloc --with-intl-api --disable-debug-symbols --enable-unaligned-private-values

find . -name autoconf.mk -type f -exec sed -i 's/-O3//g' {} \;
find . -name backend.mk -type f -exec sed -i 's/-O3//g' {} \;
find . -name autoconf.mk -type f -exec sed -i 's/FLAGS = -g/FLAGS = /g' {} \;
find . -name autoconf.mk -type f -exec sed -i 's/ -g//g' {} \;
find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [22m 46.03s]
sudo make install