tce-load -i Xorg-7.7-3d-dev glamor-egl-dev xorg-server-dev

cd xf86-video-intel-2.21.15

patch -Np1 -i ../xf86-video-intel-2.21.15-api_change-1.patch

CFLAGS="-march=i486 -mtune=i686 -Os -pipe" CXXFLAGS="-march=i486 -mtune=i686 -Os -pipe" ./configure --prefix=/usr/local --sysconfdir=/etc --localstatedir=/var --enable-kms-only --with-default-accel=sna --enable-glamor

[-lto seems to get stuck in loop with CCLD intel_drv.la]

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

make
sudo make install

xf86-video-intel 2.21.15 will be compiled with:
  Acceleration backends: *sna uxa glamor
  Additional debugging support? none
  Support for Direct Rendering Infrastructure: DRI2
  Support for Xv motion compensation (XvMC and libXvMC): yes