Do not install Mozilla, Mozilla Firefox and Mozilla Thunderbird with a single prefix since they install identically named files. The BLFS Book installs Mozilla in /usr while Mozilla Firefox and Mozilla Thunderbird are installed in /opt. If you plan to install Enigmail, extract the ipc and enigmail tarballs in the extensions directory. Compile Mozilla by running the following commands: export MOZILLA_OFFICIAL="1" && export BUILD_OFFICIAL="1" && ./configure --prefix=/usr \ --with-default-mozilla-five-home=/usr/lib/mozilla \ --enable-default-toolkit=gtk2 \ --with-x --with-system-zlib \ --with-system-jpeg --with-system-png --with-system-mng \ --enable-xft --enable-crypto \ --disable-accessibility \ --disable-tests --disable-debug \ --disable-logging --enable-reorder \ --enable-strip --disable-pedantic \ --enable-cpp-rtti --enable-extensions=all && make If installing Enigmail, execute the following steps: build/autoconf/make-makefile extensions/ipc extensions/enigmail && make -C extensions/ipc && make -C extensions/enigmail Install Mozilla as follows: make install && install -d /usr/include/mozilla-&mozilla-version;/nss && cp -Lf dist/private/nss/*.h dist/public/nss/*.h \ /usr/include/mozilla-&mozilla-version;/nss && ln -nsf mozilla-&mozilla-version; /usr/include/mozilla && ln -nsf mozilla-&mozilla-version; /usr/lib/mozilla Some libraries installed by mozilla are also needed by other packages. These libraries should be in /usr/lib so that other packages can link against these. Move them as follows: for i in lib{nspr4,plc4,plds4,nss3,smime3,softokn3,ssl3}.so libsoftokn3.chk do mv /usr/lib/mozilla-&mozilla-version;/$i /usr/lib/ ln -sf ../$i /usr/lib/mozilla-&mozilla-version;/ done Install Enigmail as follows: make -C extensions/ipc install && make -C extensions/enigmail install To enable multi-user operation, execute the following: cd /usr/lib/mozilla-&mozilla-version; && export LD_LIBRARY_PATH="/usr/lib/mozilla-&mozilla-version;" && export MOZILLA_FIVE_HOME="/usr/lib/mozilla-&mozilla-version;" && ./regxpcom && ./regchrome && touch `find /usr/lib/mozilla-&mozilla-version; -name *.rdf` Each of these switches can be added to the configure line in order to have the described effect on the Mozilla compile. --enable-elf-dynstr-gc: Removes un-referenced strings from ELF shared objects generated during the build. Note that this option breaks build on alpha. --disable-mailnews: Disable the mail and news clients. --disable-ldap: Disable LDAP Support, recommended if mail is disabled. --enable-calendar: Build the calendar client. --enable-xterm-updates: This option is for enabling the xterm title with the current command when compiling. --enable-plaintext-editor-only: Disable support for HTML editing. Do not use this switch if you are building the mail-news component.