I wrote:
> I still think that this represents under-engineering by the ICU crew
> and not anything we're doing wrong.

After some more examination of their readme.html, I tried this:

$ ./runConfigureICU MacOSX --prefix=/usr/local/icu-57.1 --enable-rpath

and that gave me sane-looking libraries:

$ otool -L /usr/local/icu-57.1/lib/libicui18n.57.1.dylib 
/usr/local/icu-57.1/lib/libicui18n.57.1.dylib:
        /usr/local/icu-57.1/lib/libicui18n.57.dylib (compatibility version 
57.0.0, current version 57.1.0)
        /usr/local/icu-57.1/lib/libicuuc.57.dylib (compatibility version 
57.0.0, current version 57.1.0)
        /usr/local/icu-57.1/lib/libicudata.57.dylib (compatibility version 
57.0.0, current version 57.1.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 1238.60.2)
        /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 
307.5.0)

--- note that now libicudata is shown as a dependency.  And then
configuring Postgres as I showed before leads to executables that
build, and initdb, and pass regression tests, and have a bunch
of ICU entries in pg_collation, without needing to fool with
DYLD_LIBRARY_PATH.

Their configure --help claims

  --enable-rpath          use rpath when linking default is only if necessary

but apparently that's for small values of "necessary" :-(

                        regards, tom lane


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