has_icu failing because of false icu path when loading icu libraries

I am trying to compile boost 1.70 with ICU support. For this I have these to commands in a shell script:

./bootstrap.sh --with-icu="$ICU_DIR}"  \
    --with-libraries=atomic,chrono,container,context,contract,coroutine,date_time,exception,fiber,filesystem,graph,graph_parallel,iostreams,locale,log,math,mpi,program_options,random,regex,serialization,stacktrace,system,test,thread,type_erasure,timer,wave

./b2 --layout=tagged \
                cxxstd=17 \
                toolset=gcc \
                variant=release \
                threading=multi \
                link=shared \
                address-model=64 \
                -sZLIB_SOURCE=$ZLIB_DIR \
                -q -sBZIP2_SOURCE=$BZIP2_DIR \
                -sICU_PATH="${ICU_DIR}" \
                include="${ICU_DIR}/include" \
                -sICU_LINK="-L${ICU_DIR}/lib64 -licuuc -licudata -licui18n"

The variable ICU_DIR is pointing to a directory, where my ICU stuff is there, i.e. in ICU_DIR/include are the header files and in ICU_DIR/lib64 are the libraries, e.g. libicudata.so.61, libicui18n.so.61. So I have this directory structure:

ICU_DIR
ICU_DIR/bin
ICU_DIR/bin64
ICU_DIR/include
ICU_DIR/lib
ICU_DIR/lib64

The directories bin and lib are for 32 bit, bin64 and lib64 respectively for 64 bit versions of the library.

During compilation I see in the logs this:

  - has_icu builds           : no
  ...
  - icu                      : yes

Then I checked the files boost_1_70_0/bin.v2/config.log. There I can find this error

bin.v2/libs/regex/build/gcc-8.3.1/debug/cxxstd-17-iso/threading-multi/visibility-hidden/has_icu: error while loading shared libraries: libicudata.so.61: cannot open shared object file: No such file or directory LD_LIBRARY_PATH="${ICU_DIR}/bin:/opt/rh/devtoolset-8/root/usr/bin:/opt/rh/devtoolset-8/root/usr/lib:/opt/rh/devtoolset-8/root/usr/lib32:/opt/rh/devtoolset-8/root/usr/lib64:$LD_LIBRARY_PATH

Then, I thought of changing my compiling command to something like this:

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${ICU_DIR}/lib64 ./b2 --layout=tagged ...

but then I get this error message during build

error: Name clash for '<p/path/to/boost_1_70_0/stage/lib>libboost_atomic-mt-x64.so.1.70.0'
error:
error: Tried to build the target twice, with property sets having
error: these incompatible properties:
error:
error:     -  none
error:     -  <dll-path>${ICU_DIR}/bin <linkflags>-L${ICU_DIR}/lib64 <linkflags>-licudata <linkflags>-licui18n <linkflags>-licuuc
error:
error: Please make sure to have consistent requirements for these
error: properties everywhere in your project, especially for install
error: targets.

This dll-path is false here. In my case, it should look to this lib64 directory not to the bin directory, but I don't know how to adjsut that when starting b2.

boostorg / build

has_icu failing because of false icu path when loading icu libraries #620