I ignored Clementine failing at updates a few times ... and now checked to see that it fails at a different test!
[100%] Linking CXX executable fmpsparser_test cd /tmp/guix-build-clementine-1.3.1-2.4619a4c.drv-0/build/tests && /gnu/store/89rj5fqcg48afgk99639ds602pgf92k4-cmake-minimal-3.16.5/bin/cmake -E cmake_link_script CMakeFiles/fmpsparser_test.dir/link.txt --verbose=1 /gnu/store/rn75fm7adgx3pw5j8pg3bczfqq1y17lk-gcc-7.5.0/bin/c+ + -std=c++0x -fpermissive -Wno-c++11-narrowing -U__STRICT_ANSI__ -O2 -g -DNDEBUG -rdynamic CMakeFiles/fmpsparser_test.dir/fmpsparser_test.cpp.o -o fmpsparser_test libgmock.a libgtest.a ../src/libclementine_lib.a libtest_utils.a /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Test.so. 5.12.7 libtest_main.a libgmock.a libgtest.a ../src/libclementine_lib.a ../ext/libclementine-spotifyblob/libclementine-spotifyblob-messages.a ../ext/libclementine-tagreader/liblibclementine-tagreader.a ../ext/libclementine-remote/liblibclementine-remote.a ../ext/libclementine-common/liblibclementine-common.a -lprotobuf -lssl -lcrypto -ltag -lmygpo-qt5 -lQt5Network -lQt5Core -lchromaprint ../3rdparty/qtsingleapplication/libqtsingleapplication.a ../3rdparty/qtiocompressor/libqtiocompressor.a -lgio-2.0 -lgstapp-1.0 -lgsttag-1.0 -lgstpbutils-1.0 -lgstvideo-1.0 -lz -lgio-2.0 -lgstapp-1.0 -lgsttag-1.0 -lgstpbutils-1.0 -lgstvideo-1.0 -lz -lpthread ../3rdparty/qocoa/libQocoa.a /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5OpenGL.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Network.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Xml.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Concurrent.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5DBus.so. 5.12.7 -lcdio -lm ../gst/moodbar/libgstmoodbar.a -lgobject-2.0 -lglib-2.0 -lgstbase-1.0 -lgstreamer-1.0 -lgstaudio-1.0 -lgobject-2.0 -lglib-2.0 -lgstbase-1.0 -lgstreamer-1.0 -lgstaudio-1.0 -lfftw3 -lmtp -lpulse ../3rdparty/qxt/libqxt.a /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Widgets.so. 5.12.7 /gnu/store/353jqf59wb1nmcd49zx3301r34nr8ibw-qtx11extras-5.12.7/lib/libQt5X11Extras.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Gui.so. 5.12.7 ../3rdparty/qsqlite/libqsqlite.a /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Sql.so. 5.12.7 /gnu/store/nash8slqngrzn2pgqrff6abz8vp6vws6-qtbase-5.12.7/lib/libQt5Core.so. 5.12.7 -lsqlite3 -lX11 -ldl collect2: error: ld returned 1 exit status make[3]: *** [tests/CMakeFiles/fmpsparser_test.dir/build.make:120: tests/fmpsparser_test] Error 1 make[3]: Leaving directory '/tmp/guix-build-clementine-1.3.1-2.4619a4c.drv-0/build' make[2]: *** [CMakeFiles/Makefile2:1592: tests/CMakeFiles/fmpsparser_test.dir/all] Error 2 make[2]: Leaving directory '/tmp/guix-build-clementine-1.3.1-2.4619a4c.drv-0/build' make[1]: *** [CMakeFiles/Makefile2:990: tests/CMakeFiles/clementine_test.dir/rule] Error 2 make[1]: Leaving directory '/tmp/guix-build-clementine-1.3.1-2.4619a4c.drv-0/build' make: *** [Makefile:388: clementine_test] Error 2