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/usr/share/xserver-xorg/configure_flags.mk is in xserver-xorg-dev-lts-xenial 2:1.18.3-1ubuntu2.3~trusty4.

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xserver_confflags = --build=x86_64-linux-gnu lt_cv_prog_compiler_static_works=no --disable-silent-rules --disable-static --without-dtrace --disable-strict-compilation --disable-debug --enable-unit-tests --with-int10=x86emu --with-extra-module-dir="/usr/lib/x86_64-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules" --with-os-vendor="Ubuntu" --with-builderstring="xorg-server 2:1.18.3-1ubuntu2.3~trusty4 (For technical support please see http://www.ubuntu.com/support)" --with-xkb-path=/usr/share/X11/xkb --with-xkb-output=/var/lib/xkb --with-shared-memory-dir=/dev/shm --enable-mitshm --enable-xres --disable-xcsecurity --disable-tslib --enable-dbe --disable-xf86bigfont --enable-dpms --enable-xshmfence --disable-config-hal --enable-config-udev --enable-xorg --disable-linux-acpi --disable-linux-apm --disable-xquartz --disable-xwin --disable-xfake --disable-xfbdev --disable-install-setuid --with-default-font-path="/usr/share/fonts/X11/misc,/usr/share/fonts/X11/cyrillic,/usr/share/fonts/X11/100dpi/:unscaled,/usr/share/fonts/X11/75dpi/:unscaled,/usr/share/fonts/X11/Type1,/usr/share/fonts/X11/100dpi,/usr/share/fonts/X11/75dpi,built-ins" --enable-aiglx --enable-composite --enable-record --enable-xv --enable-xvmc --enable-dga --enable-screensaver --enable-xdmcp --enable-xdm-auth-1 --enable-glx --enable-dri --enable-dri2 --enable-glamor --enable-dri3 --enable-libdrm --enable-present --enable-xinerama --enable-xf86vidmode --enable-xace --disable-xselinux --enable-xfree86-utils --enable-xwayland --enable-systemd-logind --enable-suid-wrapper --disable-dmx --disable-xvfb --disable-xnest --enable-kdrive --enable-xephyr --disable-xmir --with-sha1=libgcrypt --enable-xcsecurity