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Editorial Team
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Asked: 2026-05-26T00:36:52+00:00

I’m trying to build a custom ICU with a minimal data set. I’ve tried

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I’m trying to build a custom ICU with a minimal data set. I’ve tried to follow the instructions at Reducing the Size of ICU’s Data: Conversion Tables, but many of the files referenced don’t exist in the ICU 4.8.1 source distribution. Specifically, I cannot find any files that match ucm*.mk.

I’ve also tried creating reslocal.mk files as indicated in e.g. ICU’s source/data/lang/resfiles.mk. That did not help either. My build is the typical:

$ ./configure --prefix=/some/dir
$ make
$ make install

Regardless of what I do, libicudata.so.48.1 is about 17M. It shouldn’t matter, but I’m building on Ubuntu 11.04.

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1 Answer

  1. Editorial Team

    See the note at the top of that page: (see

    Note that ICU for C by default comes with pre-built data. The source
    data files are not included unless ICU is downloaded from the
    source repository. Alternatively, the Data Customizer may be used to
    customize the pre-built data.

    Your ICU is reading the prebuilt package from icu/source/data/in/*.dat and ignoring the .mk files. We have had requests for the source data to be included as a downloadable .zip and so we plan to do this in the future.

    If you have any suggestions for how our instructions can be made more clear, please file a bug. I’ve added a copy of that notice to the section you referenced.

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