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Build failure: missing link to libMathCore in omicron-plot

The conda-forge build for Omicron-3.0.0 is failing as follows:

[ 69%] Building CXX object src/CMakeFiles/omicron-plot.dir/omicron-plot.cc.o
cd $SRC_DIR/_build/src && $BUILD_PREFIX/bin/x86_64-conda-linux-gnu-c++   -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem $PREFIX/include -fdebug-prefix-map=$SRC_DIR=/usr/local/src/conda/omicron-3.0.0 -fdebug-prefix-map=$PREFIX=/usr/local/src/conda-prefix -fvisibility-inlines-hidden  -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -I$PREFIX/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/root_base_1622810086104/work=/usr/local/src/conda/root_base-6.24.0 -fdebug-prefix-map=$PREFIX=/usr/local/src/conda-prefix -std=c++17 -pipe  -fsigned-char -pthread -O2 -g -DNDEBUG -MD -MT src/CMakeFiles/omicron-plot.dir/omicron-plot.cc.o -MF CMakeFiles/omicron-plot.dir/omicron-plot.cc.o.d -o CMakeFiles/omicron-plot.dir/omicron-plot.cc.o -c $SRC_DIR/src/omicron-plot.cc
[ 73%] Linking CXX executable omicron-plot
cd $SRC_DIR/_build/src && $BUILD_PREFIX/bin/cmake -E cmake_link_script CMakeFiles/omicron-plot.dir/link.txt --verbose=1
$BUILD_PREFIX/bin/x86_64-conda-linux-gnu-c++ -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem $PREFIX/include -fdebug-prefix-map=$SRC_DIR=/usr/local/src/conda/omicron-3.0.0 -fdebug-prefix-map=$PREFIX=/usr/local/src/conda-prefix -fvisibility-inlines-hidden  -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -I$PREFIX/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/root_base_1622810086104/work=/usr/local/src/conda/root_base-6.24.0 -fdebug-prefix-map=$PREFIX=/usr/local/src/conda-prefix -std=c++17 -pipe  -fsigned-char -pthread -O2 -g -DNDEBUG -Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,--disable-new-dtags -Wl,--gc-sections -Wl,-rpath,$PREFIX/lib -Wl,-rpath-link,$PREFIX/lib -L$PREFIX/lib CMakeFiles/omicron-plot.dir/omicron-plot.cc.o -o omicron-plot  -Wl,-rpath,$SRC_DIR/_build/src: $PREFIX/lib/libCore.so $PREFIX/lib/libGraf.so $PREFIX/lib/libGpad.so -lCUtils -lRootUtils -lSegments -lTriggers libOmicronUtils.so -lCUtils -lStreams
/home/duncan/opt/miniconda3/conda-bld/omicron_1629800008628/_build_env/bin/../lib/gcc/x86_64-conda-linux-gnu/9.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: CMakeFiles/omicron-plot.dir/omicron-plot.cc.o: undefined reference to symbol '_ZN4Vc_16Common15checkLibraryAbiEjjPKc'
/home/duncan/opt/miniconda3/conda-bld/omicron_1629800008628/_build_env/bin/../lib/gcc/x86_64-conda-linux-gnu/9.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: /home/duncan/opt/miniconda3/conda-bld/omicron_1629800008628/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/lib/libMathCore.so.6.24: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [src/CMakeFiles/omicron-plot.dir/build.make:104: src/omicron-plot] Error 1
make[2]: Leaving directory '$SRC_DIR/_build'
make[1]: *** [CMakeFiles/Makefile2:184: src/CMakeFiles/omicron-plot.dir/all] Error 2
make[1]: Leaving directory '$SRC_DIR/_build'
make: *** [Makefile:159: all] Error 2

/cc @rhys.poulton