So beautiful reference card! My system is this: # guix describe Generation 9    Oct 18 2018 20:58:22    (current)   guix 33428d1     repository URL: https://git.savannah.gnu.org/git/guix.git     branch: master     commit: 33428d12672fefde745b313ce1f0c02ae9870e39 I often use `guix package -s ATOM`, assume it will be able to search by file name (when need header like intel-vga.h...) or will show all available versions # guix package --show=python name: python version: 3.6.5 outputs: out tk systems: x86_64-linux i686-linux armhf-linux aarch64-linux mips64el-linux dependencies: bzip2@1.0.6 gdbm@1.14.1 libffi@3.2.1 openssl@1.0.2o + pkg-config@0.29.2 readline@7.0.3 sqlite@3.23.0 tcl@8.6.8 tk@8.6.8 zlib@1.2.11 location: gnu/packages/python.scm:370:2 homepage: https://www.python.org license: Python Software Foundation License synopsis: High-level, dynamically-typed programming language  description: Python is a remarkably powerful dynamic programming language that + is used in a wide variety of application domains.  Some of its key + distinguishing features include: clear, readable syntax; strong introspection + capabilities; intuitive object orientation; natural expression of procedural + code; full modularity, supporting hierarchical packages; exception-based error + handling; and very high level dynamic data types. name: python version: 2.7.14 outputs: out tk systems: x86_64-linux i686-linux armhf-linux aarch64-linux mips64el-linux dependencies: bzip2@1.0.6 gdbm@1.14.1 libffi@3.2.1 openssl@1.0.2o + pkg-config@0.29.2 readline@7.0.3 sqlite@3.23.0 tcl@8.6.8 tk@8.6.8 zlib@1.2.11 location: gnu/packages/python.scm:364:2 homepage: https://www.python.org license: Python Software Foundation License synopsis: High-level, dynamically-typed programming language  description: Python is a remarkably powerful dynamic programming language that + is used in a wide variety of application domains.  Some of its key + distinguishing features include: clear, readable syntax; strong introspection + capabilities; intuitive object orientation; natural expression of procedural + code; full modularity, supporting hierarchical packages; exception-based error + handling; and very high level dynamic data types. # guix package --show=python3 #