I'm maintaining a system that still uses an old libc version not including
librt and libpthread.

Migrating to ptxdist 2025.05.0, I got an error while configuring
utils-linux 2.41.

meson says:
../util-linux-2.41/meson.build:1482:22: ERROR: Object
<[ExternalLibraryHolder] holds [ExternalLibrary]: <ExternalLibrary rt:
True>> of type ExternalLibrary does not support the `+` operator.

The bug is a missing + at line 1478 of meson.build.

A patch is attached.

The bug has been already found and corrected upstream. I expect it will be
fixed in version 2.42.

Best regards,

Ruggero