[cannot compile in 16gb ram]

tce-load -i gperf perl_archive_zip automake libtool-dev gtk3-dev gtk2-dev cups-dev curl-dev gst-plugins-base-dev harfbuzz-icu-dev lcms2-dev librsvg-dev libxslt-dev nss-dev poppler-dev libsane-dev bash tar coreutils unzip zip dbus-glib-dev wget neon-dev python3-dev libbluetooth-dev dconf-dev desktop-file-utils nasm gvfs-dev zenity glu-dev

cd /usr/local/bin
sudo rm python
sudo ln -s python3 python

cd libreoffice-5.1.0.3

sed -e "/gzip -f/d" -e "s|.1.gz|.1|g" -i bin/distro-install-desktop-integration
sed -e "/distro-install-file-lists/d" -i Makefile.in
sed -i "s#isnan#std::&#g" xmloff/source/draw/ximp3dscene.cxx

chmod +x bin/unpack-sources

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe" ./autogen.sh --prefix=/usr/local --enable-gtk3 --without-help --with-system-libs --without-system-libcmis --without-java --without-junit --without-system-graphite --disable-extensions --without-system-lpsolve --without-system-libexttextcat --without-doxygen --without-myspell-dicts --with-alloc=system --disable-odk --disable-postgresql-sdbc --without-system-clucene --without-system-npapi-headers --without-system-odbc --without-system-openldap --without-system-redland --with-parallelism=4 --enable-python=system --without-system-libodfgen --without-system-libcdr --without-system-libmspub --without-system-libmwaw --without-system-libvisio --without-system-libwpd --without-system-cppunit --without-system-libwps --without-system-libwpg --without-system-mdds --without-system-vigra --without-system-boost \

--without-system-orcus --without-system-hunspell --without-system-altlinuxhyph --without-system-mythes --without-system-liblangtag --disable-sdremote-bluetooth --without-system-librevenge --without-system-libebook --without-system-libetonyek --without-system-libfreehand --without-system-libabw --without-system-firebird --without-system-glm --without-system-glew --without-system-libpagemaker --without-system-coinmp --without-system-libgltf

time make build [3h 52m 22s]
sudo make distro-pack-install