After trying and failing to build with keep-builds, I went to the build directory and ran guix shell -D telegram-desktop --pure make The error seems to be here: cd /tmp/guix-build-telegram-desktop-4.2.2.drv-0/build/Telegram/lib_base && /gnu/store/5lqhcv91ijy82p92ac6g5xw48l0lwwz4-gcc-11.3.0/bin/c++ -DCRL_USE_COMMON_QUEUE -DDESKTOP_APP_DISABLE_CRASH_REPORTS -DDESKTOP_APP_USE_PACKAGED -DDESKTOP_APP_USE_PACKAGED_RLOTTIE -DKCOREADDONS_LIB -DQT_CORE_LIB -DQT_GUI_LIB -DQT_IMPLICIT_QCHAR_CONSTRUCTION -DQT_NETWORK_LIB -DQT_NO_CAST_FROM_BYTEARRAY -DQT_NO_DEBUG -DQT_NO_KEYWORDS -DQT_SVG_LIB -DQT_WIDGETS_LIB -D_FORTIFY_SOURCE=2 -D_GLIBCXX_ASSERTIONS -I/tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base -I/tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_rpl -I/tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_crl -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5 -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtCore -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/lib/qt5/mkspecs/linux-g++ -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtCore/5.15.8 -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtCore/5.15.8/QtCore -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtGui -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtGui/5.15.8 -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtGui/5.15.8/QtGui -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtWidgets -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtWidgets/5.15.8 -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtWidgets/5.15.8/QtWidgets -isystem /gnu/store/q4wh2qxhhwvx6azbx0y2if4m8vgkghvj-qtbase-5.15.8/include/qt5/QtNetwork -isystem /gnu/store/6q7k9jp3bzs611465m68gdd99fgkvx0k-qtsvg-5.15.8/include/qt5 -isystem /gnu/store/6q7k9jp3bzs611465m68gdd99fgkvx0k-qtsvg-5.15.8/include/qt5/QtSvg -isystem /gnu/store/smjbmncdx0v794ylqc2qnr8k7apdgzqg-libexpected-1.1.0/share -isystem /gnu/store/2j6iah1gp2nfp8g8hhrq5l1n32jhzr29-kcoreaddons-5.98.0/include/KF5/KCoreAddons -isystem /gnu/store/2j6iah1gp2nfp8g8hhrq5l1n32jhzr29-kcoreaddons-5.98.0/include/KF5 -isystem /gnu/store/nb40pwd37v6i1g4b1fq4l6q4h9px3asr-glib-2.72.3/include/glib-2.0 -isystem /gnu/store/nb40pwd37v6i1g4b1fq4l6q4h9px3asr-glib-2.72.3/lib/glib-2.0/include -isystem /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/giomm-2.4 -isystem /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/lib/giomm-2.4/include -isystem /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4 -isystem /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/lib/glibmm-2.4/include -isystem /gnu/store/gwx2sf5wl9bsl21lwv35g5la63bwyy95-util-linux-2.37.4-lib/include/libmount -isystem /gnu/store/gwx2sf5wl9bsl21lwv35g5la63bwyy95-util-linux-2.37.4-lib/include/blkid -isystem /gnu/store/7al95rd1f6r6af5rwk9yjicw8pf2ljyr-libsigc++-2.9.3/include/sigc++-2.0 -isystem /gnu/store/7al95rd1f6r6af5rwk9yjicw8pf2ljyr-libsigc++-2.9.3/lib/sigc++-2.0/include -isystem /gnu/store/nb40pwd37v6i1g4b1fq4l6q4h9px3asr-glib-2.72.3/include/gio-unix-2.0 -O2 -g -DNDEBUG -fstack-protector-all -fstack-clash-protection -fPIC -fno-strict-aliasing -pipe -Wall -Wextra -Wno-unused-parameter -Wno-switch -Wno-maybe-uninitialized -Wno-missing-field-initializers -Wno-sign-compare -Wno-deprecated -Wno-deprecated-declarations -pthread -std=gnu++20 -Winvalid-pch -include /tmp/guix-build-telegram-desktop-4.2.2.drv-0/build/Telegram/lib_base/CMakeFiles/lib_base.dir/cmake_pch.hxx -MD -MT Telegram/lib_base/CMakeFiles/lib_base.dir/base/platform/linux/base_file_utilities_linux.cpp.o -MF CMakeFiles/lib_base.dir/base/platform/linux/base_file_utilities_linux.cpp.o.d -o CMakeFiles/lib_base.dir/base/platform/linux/base_file_utilities_linux.cpp.o -c /tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base/base/platform/linux/base_file_utilities_linux.cpp In file included from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/containerhandle_shared.h:23, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/object.h:34, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/interface.h:20, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/giomm-2.4/giomm/applaunchcontext.h:29, from /tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base/base/platform/linux/base_linux_app_launch_context.h:10, from /tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base/base/platform/linux/base_file_utilities_linux.cpp:14: /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:956:24: error: expected unqualified-id before ')' token 956 | Variant(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1017:25: error: expected unqualified-id before ')' token 1017 | Variant< Variant >(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1070:26: error: expected unqualified-id before ')' token 1070 | Variant(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1240:24: error: expected unqualified-id before ')' token 1240 | Variant(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1286:30: error: expected unqualified-id before ')' token 1286 | Variant< std::pair >() | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1335:29: error: expected unqualified-id before ')' token 1335 | Variant< std::vector >() | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1404:41: error: expected unqualified-id before ')' token 1404 | Variant< std::vector >(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1530:39: error: expected unqualified-id before ')' token 1530 | Variant< std::vector >(); | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1606:29: error: expected unqualified-id before ')' token 1606 | Variant< std::map >() | ^ /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1679:33: error: expected unqualified-id before ')' token 1679 | Variant>() | ^ In file included from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant.h:1742, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/containerhandle_shared.h:23, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/object.h:34, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/interface.h:20, from /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/giomm-2.4/giomm/applaunchcontext.h:29, from /tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base/base/platform/linux/base_linux_app_launch_context.h:10, from /tmp/guix-build-telegram-desktop-4.2.2.drv-0/source/Telegram/lib_base/base/platform/linux/base_file_utilities_linux.cpp:14: /gnu/store/cbjgz6f8nrb7804nnmmlvpd4y78p8zf3-glibmm-2.64.5/include/glibmm-2.4/glibmm/variant_basictypes.h:23:17: error: expected unqualified-id before ')' token 23 | Variant() Hope this helps! Yours faithfully, John Khoo Notice: This email is generated from the account of an NUS alumnus. Contents, views, and opinions therein are solely those of the sender.