tce-load -i compiletc xcb-proto libXau-dev libXdmcp-dev python3.6

wget https://xorg.freedesktop.org/archive/individual/lib/libxcb-1.14.tar.xz

cd libxcb-1.14

sed -i "s/pthread-stubs//" configure

PYTHON=python3 CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe -Wno-error=format-extra-args" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --sysconfdir=/etc --without-doxygen

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

make [0m 26.64s]
make install

  Package: libxcb 1.14

  Configuration
    XDM support.........: yes
    sendmsg fd passing..: yes
    Build unit tests....: no
      with html results.: no
    XCB buffer size.....: 16384

  X11 extensions
    Composite...........: yes
    Damage..............: yes
    Dpms................: yes
    Dri2................: yes
    Dri3................: yes
    GenericEvent........: no
    Glx.................: yes
    Randr...............: yes
    Record..............: yes
    Render..............: yes
    Resource............: yes
    Screensaver.........: yes
    selinux.............: no
    Shape...............: yes
    Shm.................: yes
    Sync................: yes
    Xevie...............: no
    Xfixes..............: yes
    Xfree86-dri.........: yes
    xinerama............: yes
    xinput..............: yes
    xkb.................: yes
    xprint..............: no
    xtest...............: yes
    xv..................: yes
    xvmc................: yes

  Used CFLAGS:
    CPPFLAGS............: 
    CFLAGS..............: -g -O2

  Installation:
    Prefix..............: /usr/local