This is what I did and got:

Downloaded and run qt-unified-linux-x64-3.0.4-online.run

Configured for 5.11.1 everything except QtPurchasing

/opt/QtBBBuildDir5.11.1> git config --global user.email
"bayou.pan@cem.com"
/opt/QtBBBuildDir5.11.1> git config --global user.name "Bayou
Pan"

/opt/QtBBBuildDir5.11.1> /opt/QtBB5.11.1/5.11.1/Boot2Qt/sources/meta-
boot2qt/b2qt-init-build-env init --device beagleboard

/opt/QtBBBuildDir5.11.1> source ./setup-environment.sh

### Shell environment set up for builds. ###

You can now run 'bitbake <target>'

/opt/QtBBBuildDir5.11.1/build-beagleboard> bitbake b2qt-embedded-qt5-image
Loading cache: 100%
|################################################# #####################| Time:
0:00:00
Loaded 3154 entries from dependency cache.
NOTE: Resolving any missing task queue dependencies
ERROR: Nothing RPROVIDES 'weston' (but /opt/QtBBBuildDir5.11.1/sources/meta-
boot2qt/meta-boot2qt-distro/recipes-core/packagegroups/packagegroup-b2qt-
embedded-base.bb RDEPENDS on or otherwise requires it)
ERROR: weston was skipped: missing required distro feature 'opengl' (not in
DISTRO_FEATURES)
ERROR: weston was skipped: missing required distro feature 'opengl' (not in
DISTRO_FEATURES)
NOTE: Runtime target 'weston' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['weston']
NOTE: Runtime target 'packagegroup-b2qt-embedded-base' is unbuildable,
removing...
Missing or unbuildable dependency chain was: ['packagegroup-b2qt-embedded-
base', 'weston']
ERROR: Required build target 'b2qt-embedded-qt5-image' has no buildable
providers.
Missing or unbuildable dependency chain was: ['b2qt-embedded-qt5-image',
'packagegroup-b2qt-embedded-base', 'weston']

Summary: There were 2 ERROR messages shown, returning a non-zero exit code.