Hi Julian, I hadn't realized that you are the author of gzochi.
What I meant was that gmp end up being referenced by gzochi even dough it's not explicitly in the inputs field. Are you saying that this shouldn't be the case then? guix gc --references $(guix build gzochi) /gnu/store/00qwdmjrzflh0q4g9n18wcx8nvhhxcj1-bdb-6.2.23 /gnu/store/1c7rrngfbrfspfvwj7vvasvmc1cjqjlh-libltdl-2.4.6 /gnu/store/1qv5i6rfxjc4d0rg7z6r9dapmf85kzmy-gnutls-3.5.2 /gnu/store/2z0lv1px7izrmzxsqi3555yavqa56mkq-libidn-1.32 /gnu/store/3fhnmvbdxlsh64pr3zg4y74x3hlx33qw-libtasn1-4.8 /gnu/store/5992iq1v7arqa14ym3di58n4la0893nv-zlib-1.2.8 /gnu/store/5n16jhjpw494jrq87va51wqsmgaqm0yb-sdl-1.2.15 /gnu/store/7zhj5adf7kq7pr6j46wj1gjdc8vi0mwk-nettle-3.2 /gnu/store/95x5fxvcggyaa8ymjjgv5q0dnzkrign9-guile-2.0.11 /gnu/store/9nifwk709wajpyfwa0jzaa3p6mf10vxs-gcc-4.9.3-lib /gnu/store/b8i9qnxwd4lsxk0g09xnkgshfn4arpmz-libmicrohttpd-0.9.50 >> /gnu/store/cdkrfbl10kbyyjjw3yfk9hckfw8n1b7g-gmp-6.1.0 /gnu/store/i9yr2vg3ksp7iyvvinwv9js82rgv4l04-libunistring-0.9.6 /gnu/store/l1s4cw9g58hmcpd2qgbckfl228143qzx-glib-2.48.0 /gnu/store/lv1jqm6cd9l265jwnihd48a5n7qxzg4d-libgcrypt-1.7.0 /gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23 /gnu/store/sncfamh3fjrrdgd950d79g6yml2s6a07-libffi-3.2.1 /gnu/store/wdsqcvk2wrr83w4lyr4acpgscn07w6hy-libgpg-error-1.22 /gnu/store/x09wbcsh8wjc5y9yhc9mwf2a9gjnc0hv-libgc-7.4.2 /gnu/store/xl19qrfzga52vrvp4ncccwjlnrjqwj95-ncurses-6.0 /gnu/store/z4d6bwpzr05ga4mih3nza8k3jal37b5a-gzochi-0.10 /gnu/store/zwc6ck9j0wv80kz5snw5acwb39ws88m1-pcre-8.38