Problem building OS, anyone recognise it?

It worked fine before I went on holiday!

HeroNames (Sources.SystemRes.HeroNames)...
amu -E  install_rom INSTDIR=SDFS::RISCOSpi.$.Public.BCM2835.RiscOS.Install.ROOL.CKernel.RISC_OS COMPONENT=HeroNames TARGET=HeroNames 
copy LocalUserIFRes:HeroNames SDFS::RISCOSpi.$.Public.BCM2835.RiscOS.Install.ROOL.CKernel.RISC_OS.HeroNames ~cfr~v
HeroNames: rom module installed
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------------------------------------------------------------------------------

Summary of linked ROM contents...

I have found those “spurious” lines in old build logs from 2023, Pi, Titanium and IOMD. The ROM image is built, they are not a show stopper.

HeroNames: rom module installed
No output file for this component
...
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Summary of linked ROM contents...

Module name                Position in ROM  Module size
-----------                ---------------  -----------
HAL_BCM2835                FC000000         0000C668
...
HeroNames                  FC4BEDC4         000002B9

Total of 139 modules.
==============================================================================
Starting phase join ...
romlinker: version 0.07 (08 Apr 2023)
romlinker: Standard ROM image construction
romlinker: Warning: Insufficient space for ROM symbols
romlinker: Image has 266084 bytes spare (259.85K)
romlinker: crc16=cc9a

==============================================================================
Finished ROOL.BCM2835 build : Fri Feb 14 15:40:29 2025
------------------------------------------------------------------------------
Closing log file 'RAM::RamDisc0.$.ROOL.Pi.BCM2835.RiscOS.BuildSys.Logs.aURZ00-00'.

Unfortunately, I don’t get a ROM image.

That would be because I had the wrong two boxes ticked. Make and Install, rather than Install and Join! Sorry.