【ビルド環境構築】
root@803c79f111bb:/home# apt-get install qt5-qmake        
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  qt5-qmake-bin qtchooser
The following NEW packages will be installed:
  qt5-qmake qt5-qmake-bin qtchooser
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 1187 kB of archives.
After this operation, 4740 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://deb.debian.org/debian bullseye/main arm64 qt5-qmake-bin arm64 5.15.2+dfsg-9 [913 kB]
Get:2 http://deb.debian.org/debian bullseye/main arm64 qtchooser arm64 66-2 [24.9 kB]
Get:3 http://deb.debian.org/debian bullseye/main arm64 qt5-qmake arm64 5.15.2+dfsg-9 [249 kB]
Fetched 1187 kB in 1s (836 kB/s)   
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package qt5-qmake-bin.
(Reading database ... 32221 files and directories currently installed.)
Preparing to unpack .../qt5-qmake-bin_5.15.2+dfsg-9_arm64.deb ...
Unpacking qt5-qmake-bin (5.15.2+dfsg-9) ...
Selecting previously unselected package qtchooser.
Preparing to unpack .../qtchooser_66-2_arm64.deb ...
Unpacking qtchooser (66-2) ...
Selecting previously unselected package qt5-qmake:arm64.
Preparing to unpack .../qt5-qmake_5.15.2+dfsg-9_arm64.deb ...
Unpacking qt5-qmake:arm64 (5.15.2+dfsg-9) ...
Setting up qt5-qmake-bin (5.15.2+dfsg-9) ...
Setting up qtchooser (66-2) ...
Setting up qt5-qmake:arm64 (5.15.2+dfsg-9) ...

【qmake失敗】
root@803c79f111bb:/home/helloworld# qmake
Info: creating stash file /home/helloworld/.qmake.stash
Project ERROR: Unknown module(s) in QT: core gui widgets