Cannot build wayland-egl driver

[dilyn]

I'm attempting to build qt5-wayland from source on Linux. I build mesa with the wayland platform, I have wayland{-protocols}, libxkbcommon installed, I see no obvious failures at any configure check - indeed, qt5-wayland says that I pass every check - and yet the wayland-egl driver is disabled! I'm uncertain how to progress. There doesn't seem to be any obvious way of forcing qt5-wayland to build it. Below are how I'm building mesa, qt5, and qt5-wayland and their respective outputs.

Mesa:
meson
--prefix=/usr
--sysconfdir=/etc
--mandir=/usr/share/man
--localstatedir=/var
--buildtype=release
-Db_lto=true
-Dplatforms=wayland,drm
-Ddri-drivers=i965
-Dgallium-drivers=i915
-Dvulkan-drivers=intel
-Dglx=disabled
-Dglvnd=true
. build

Build-time dependency wayland-scanner found: YES 1.18.0
Program /usr/bin/wayland-scanner found: YES
Run-time dependency wayland-protocols found: YES 1.20
Run-time dependency wayland-client found: YES 1.18.0
Run-time dependency wayland-server found: YES 1.18.0
Run-time dependency wayland-egl-backend found: YES 3
Library sensors found: NO
Program nm found: YES
Program symbols-check.py found: YES
Program install_megadrivers.py found: YES
WARNING: Gettext not found, all translation targets will be ignored.
Program /tmp/build-17323/mesa/bin/install_megadrivers.py found: YES (/usr/bin/python /tmp/build-17323/mesa/bin/install_megadrivers.py)
Checking for function "mincore" : YES
Program /tmp/build-17323/mesa/bin/install_megadrivers.py found: YES (/usr/bin/python /tmp/build-17323/mesa/bin/install_megadrivers.py)
Configuring xa_tracker.h using configuration
Message: Configuration summary:

    prefix:          /usr
    libdir:          lib
    includedir:      include
    
    OpenGL:          yes (ES1: yes ES2: yes)
    OSMesa:          no
    
    DRI platform:    drm
    DRI drivers:     i965
    DRI driver dir:  /usr/lib/dri
    
    EGL:             yes
    EGL drivers:     builtin:egl_dri2 builtin:egl_dri3
    GBM:             yes
    EGL/Vulkan/VL platforms:   wayland drm
    
    Vulkan drivers:  intel
    Vulkan ICD dir:  share/vulkan/icd.d
    
    llvm:            yes
    llvm-version:    10.0.1
    
    Gallium drivers: i915
    Gallium st:      mesa xa
    HUD lmsensors:   no
    
    Shared-glapi:    yes

Build targets in project: 169

Qt5:
./configure
-confirm-license
-opensource
-prefix /usr
-docdir /usr/share/doc/qt
-headerdir /usr/include/qt
-archdatadir /usr/lib/qt
-datadir /usr/share/qt
-sysconfdir /etc/xdg
-examplesdir /usr/share/doc/qt/examples
-nomake examples
-nomake tests
-optimized-qmake
-platform linux-clang-libc++
-no-libudev
-no-separate-debug-info
-no-pch
-no-dbus
-no-accessibility
-no-gtk
-no-glib
-system-libjpeg
-system-libpng
-system-sqlite
-system-zlib
-system-freetype
-system-harfbuzz
-silent

Creating qmake...
Done.
Info: creating cache file /tmp/build-18343/qt5/.qmake.cache
Info: creating stash file /tmp/build-18343/qt5/.qmake.stash

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Checking for machine tuple... yes
Checking for valid makespec... yes
Checking for target architecture... x86_64
Checking for SSE2 instructions... yes
Checking for AES new instructions... yes
Checking for alloca() in alloca.h... yes
Checking for SSE3 instructions... yes
Checking for SSSE3 instructions... yes
Checking for SSE4.1 instructions... yes
Checking for SSE4.2 instructions... yes
Checking for AVX instructions... yes
Checking for AVX2 instructions... yes
Checking for AVX512 F instructions... yes
Checking for AVX512 BW instructions... yes
Checking for AVX512 CD instructions... yes
Checking for AVX512 DQ instructions... yes
Checking for AVX512 ER instructions... yes
Checking for AVX512 IFMA instructions... yes
Checking for AVX512 PF instructions... yes
Checking for AVX512 VBMI instructions... yes
Checking for AVX512 VL instructions... yes
Checking for C++14 support... yes
Checking for C++17 support... yes
Checking for C99 support... yes
Checking for C11 support... yes
Checking for pkg-config... yes
Checking for dlopen()... yes
Checking for new dtags support... yes
Checking for F16C instructions... yes
Checking for D-Bus >= 1.2 (host)... yes
Checking for Support for Intel Control-flow Enforcement Technology... no
Checking for POSIX fallocate()... yes
Checking for RDRAND instruction... yes
Checking for RDSEED instruction... yes
Checking for symbol visibility support... yes
Checking for -Bsymbolic-functions support... yes
Checking for SHA new instructions... yes
Checking for Signaling NaN for doubles... yes
Checking for STL compatibility... yes
Checking for zlib... yes
Checking for Intrinsics without -mXXX argument... yes
Checking for Zstandard... no
Checking for clock_gettime()... yes
Checking for POSIX monotonic clock... yes
Checking for C++11 <future>... yes
Checking for eventfd... yes
Checking for futimens()... yes
Checking for getauxval()... yes
Checking for getentropy()... yes
Checking for GNU libc... no
Checking for POSIX iconv... yes
Checking for ICU... no
Checking for inotify... yes
Checking for SysV IPC... yes
Checking for linkat()... yes
Checking for ppoll()... yes
Checking for PCRE2... no
Checking for renameat2()... no
Checking for slog2... no
Checking for statx() in libc... no
Checking for 64 bit atomics... yes
Checking for DoubleConversion... no
Checking for O_CLOEXEC... yes
Checking for C++11 <random>... yes
Checking for working std::atomic for function pointers... yes
Checking for OpenSSL Headers... yes
Checking for DTLS support in OpenSSL... no
Checking for getifaddrs()... yes
Checking for KRB5 GSSAPI Support... no
Checking for IPv6 ifname... yes
Checking for Linux AF_NETLINK sockets... yes
Checking for OCSP stapling support in OpenSSL... yes
Checking for Desktop OpenGL... no
Checking for OpenGL ES 2.0... yes
Checking for KMS... yes
Checking for DRM Atomic API... yes
Checking for EGL... no
Checking for evdev... yes
Checking for FreeType... yes
Checking for Fontconfig... yes
Checking for GBM... yes
Checking for LinuxFB... yes
Checking for mtdev... yes
Checking for OpenGL ES 3.0... yes
Checking for OpenGL ES 3.1... yes
Checking for OpenGL ES 3.2... yes
Checking for OpenVG... no
Checking for default QPA platform... xcb
Checking for HarfBuzz... yes
Checking for libjpeg... yes
Checking for libpng... yes
Checking for libmd4c... no
Checking for XCB >= 1.11... no
Checking for tslib... no
Checking for Vulkan... no
Checking for XLib... no
Checking for xkbcommon >= 0.5.0... yes
Checking for xkbcommon-x11... no
Checking for CUPS... no
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... no
Checking for OCI (Oracle)... no
Checking for ODBC... no
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Checking for SQLite (version 3)... yes
Done running configuration tests.

Configure summary:

Build type: linux-clang-libc++ (x86_64, CPU features: mmx sse sse2)
Compiler: clang 10.0.1
Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c largefile rdrnd rdseed shani silent x86SimdAlways shared shared rpath release c++11 c++14 c++17 c++1z concurrent reduce_exports reduce_relocations release_tools stl
Build options:
Mode ................................... release; optimized tools
Optimize release build for size ........ no
Building shared libraries .............. yes
Using C standard ....................... C11
Using C++ standard ..................... C++17
Using ccache ........................... no
Using new DTAGS ........................ yes
Relocatable ............................ yes
Using precompiled headers .............. no
Using LTCG ............................. no
Target compiler supports:
SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
AVX .................................. AVX AVX2
AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
Other x86 ............................ AES F16C RDRAND SHA
Intrinsics without -mXXX option ...... yes
Build parts ............................ libs tools
Qt modules and options:
Qt Concurrent .......................... yes
Qt D-Bus ............................... no
Qt D-Bus directly linked to libdbus .... no
Qt Gui ................................. yes
Qt Network ............................. yes
Qt Sql ................................. yes
Qt Testlib ............................. yes
Qt Widgets ............................. yes
Qt Xml ................................. yes
Support enabled for:
Using pkg-config ....................... yes
udev ................................... no
Using system zlib ...................... yes
Zstandard support ...................... no
Qt Core:
DoubleConversion ....................... yes
Using system DoubleConversion ........ no
GLib ................................... no
iconv .................................. yes
ICU .................................... no
Built-in copy of the MIME database ..... yes
Tracing backend ........................ <none>
Logging backends:
journald ............................. no
syslog ............................... no
slog2 ................................ no
PCRE2 .................................. yes
Using system PCRE2 ................... no
Qt Network:
getifaddrs() ........................... yes
IPv6 ifname ............................ yes
libproxy ............................... no
Linux AF_NETLINK ....................... yes
OpenSSL ................................ yes
Qt directly linked to OpenSSL ........ no
OpenSSL 1.1 ............................ yes
DTLS ................................... no
OCSP-stapling .......................... yes
SCTP ................................... no
Use system proxies ..................... yes
GSSAPI ................................. no
Qt Gui:
Accessibility .......................... no
FreeType ............................... yes
Using system FreeType ................ yes
HarfBuzz ............................... yes
Using system HarfBuzz ................ yes
Fontconfig ............................. yes
Image formats:
GIF .................................. yes
ICO .................................. yes
JPEG ................................. yes
Using system libjpeg ............... yes
PNG .................................. yes
Using system libpng ................ yes
Text formats:
HtmlParser ........................... yes
CssParser ............................ yes
OdfWriter ............................ yes
MarkdownReader ....................... yes
Using system libmd4c ............... no
MarkdownWriter ....................... yes
EGL .................................... no
OpenVG ................................. no
OpenGL:
Desktop OpenGL ....................... no
OpenGL ES 2.0 ........................ yes
OpenGL ES 3.0 ........................ yes
OpenGL ES 3.1 ........................ yes
OpenGL ES 3.2 ........................ yes
Vulkan ................................. no
Session Management ..................... yes
Features used by QPA backends:
evdev .................................. yes
libinput ............................... no
INTEGRITY HID .......................... no
mtdev .................................. yes
tslib .................................. no
xkbcommon .............................. yes
X11 specific:
XLib ................................. no
XCB Xlib ............................. no
EGL on X11 ........................... no
xkbcommon-x11 ........................ no
QPA backends:
DirectFB ............................... no
EGLFS .................................. no
LinuxFB ................................ yes
VNC .................................... yes
Qt Sql:
SQL item models ........................ yes
Qt Widgets:
GTK+ ................................... no
Styles ................................. Fusion Windows
Qt PrintSupport:
CUPS ................................... no
Qt Sql Drivers:
DB2 (IBM) .............................. no
InterBase .............................. no
MySql .................................. no
OCI (Oracle) ........................... no
ODBC ................................... no
PostgreSQL ............................. no
SQLite2 ................................ no
SQLite ................................. yes
Using system provided SQLite ......... yes
TDS (Sybase) ........................... no
Qt Testlib:
Tester for item models ................. yes

Qt5-wayland:
qmake

-> qt5-wayland Starting build
Info: creating stash file /tmp/build-16006/qt5-wayland/.qmake.stash
Info: creating cache file /tmp/build-16006/qt5-wayland/.qmake.cache

Running configuration tests...
Checking for Wayland client library... yes
Checking for Wayland cursor library... yes
Checking for wayland-scanner... yes
Checking for Wayland EGL library... yes
Checking for wayland-server... yes
Done running configuration tests.

Configure summary:

Qt Wayland Drivers:
EGL .................................... no
Raspberry Pi ........................... no
XComposite EGL ......................... no
XComposite GLX ......................... no
DRM EGL ................................ no
libhybris EGL .......................... no
Linux dma-buf server buffer integration . no
Vulkan-based server buffer integration . no
Shm emulation server buffer integration . yes
Qt Wayland Client Shell Integrations:
xdg-shell .............................. yes
xdg-shell unstable v5 (deprecated) ..... yes
xdg-shell unstable v6 .................. yes
ivi-shell .............................. yes
wl-shell (deprecated) .................. yes
Qt Wayland Client ........................ yes
Qt Wayland Compositor .................... yes
Qt Wayland Compositor Layer Plugins:
VSP2 hardware layer integration ........ no

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/usr'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.