tce-load -i compiletc xorg-proto xtrans libxcb-dev

wget https://www.x.org/archive/individual/lib/libX11-1.8.12.tar.xz

cd libX11-1.8.12

CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --sysconfdir=/etc

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [1m 23.18s]
sudo make install

libX11 1.8.12 will be built with the following settings:
 Loadable i18n module support:            no
 Loadable xcursor library support:        yes
 Threading support:                       yes
 Use Threads safe API:                    yes
 Use thread safety constructor:           yes
 XCMS:                                    yes
 Internationalization support:            yes
 XF86BigFont support:                     yes
 XKB support:                             yes
 XLOCALEDIR environment variable support: yes
 Compose table cache enabled:             yes
 Functional specs building enabled:       yes