I tried getting SerenityOS to run on my Gentoo system. Unfortunately I get this output:

$ ./Meta/serenity.sh run
[0/5] Performing build step for 'lagom'
ninja: no work to do.
[1/5] Performing install step for 'lagom'
[0/1] Install the project...
-- Install configuration: ""
[2/5] Performing build step for 'serenity'
[0/2] Re-checking globbed directories...
[3/3] Linking CXX executable Kernel/Prekernel/kernel_x86-64
[3/5] Performing install step for 'serenity'
[0/2] Re-checking globbed directories...
[3/4] Install the project...
-- Install configuration: ""
[5/5] Completed 'serenity'
ninja: Entering directory `/home/user/software/sys-os/serenity/Build/x86_64'
[0/2] Re-checking globbed directories...
[3/4] Install the project...
-- Install configuration: ""
ninja: Entering directory `/home/user/software/sys-os/serenity/Build/x86_64'
[0/2] Re-checking globbed directories...
[0/1] cd /home/user/software/sys-os/serenity/Build/x86_64 && /usr/bin/cmake -E env SERENITY_...OLCHAIN=GNU LLVM_VERSION=13.2.0 /home/user/software/sys-os/serenity/Meta/build-image-qemu.s
doas (user@weerwolf) password: 
find: ‘/Base’: No such file or directory
du: cannot access '/Base': No such file or directory
checking existing image
e2fsck 1.47.1 (20-May-2024)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
_disk_image: 11/99072 files (0.0% non-contiguous), 3672/368500 blocks
done
mounting filesystem... done
die: SERENITY_SOURCE_DIR is not set
unmounting filesystem... done
FAILED: CMakeFiles/qemu-image _disk_image /home/user/software/sys-os/serenity/Build/x86_64/CMakeFiles/qemu-image /home/user/software/sys-os/serenity/Build/x86_64/_disk_image 
cd /home/user/software/sys-os/serenity/Build/x86_64 && /usr/bin/cmake -E env SERENITY_SOURCE_DIR=/home/user/software/sys-os/serenity SERENITY_ARCH=x86_64 SERENITY_TOOLCHAIN=GNU LLVM_VERSION=13.2.0 /home/user/software/sys-os/serenity/Meta/build-image-qemu.sh
ninja: build stopped: subcommand failed.

I'm using GCC 14.2.1