more detail. I install a package, here I use autojump as arbitrary example:

    1  >>>>>>>>> guix package -i autojump
    2 The following package will be installed:
    3    autojump     22.2.4  /gnu/store/9x1hcpjwrqy7f8l0jg89kcp4f2dzs3hm-autojump-22.2.4
    4
    5 substitute: updating list of substitutes from 'http://hydra.gnu.org'... 100.0%
    6 The following derivations will be built:
    7    /gnu/store/cgsfhli7k66a88lhf2pdr5k45mj8rkkr-profile.drv

   14 The following files will be downloaded:
   15    /gnu/store/9x1hcpjwrqy7f8l0jg89kcp4f2dzs3hm-autojump-22.2.4
  lines clipped
   21 Found valid signature for /gnu/store/046h0w39ar90xv1al1vgw69i08jmr5qk-module-import-compiled
   22 From http://hydra.gnu.org/nar/046h0w39ar90xv1al1vgw69i08jmr5qk-module-import-compiled

lines clipped

   43 Downloading 6nsq08…-module-import-compiled (60KiB installed)...
   44  http://hydra.gnu.org/nar/6nsq08kqq4r71r37zz4l835pn68y27d1-module-import-compiled 200KiB/s 00:00 | 21KiB transferred
   45 warning: collision encountered: /gnu/store/892962rlrgjfflmh2z50wbcmcbcpki6i-rhythmbox-3.2.1/share/icons/hicolor/icon-      theme.cache /gnu/store/1923z10sh48xjf0y103flz21lkkrkp8x-gtk+-3.18.2/share/icons/hicolor/icon-theme.cache /gnu/store/d      8z1qyk4cysjl2fkdssddr6hbw81z56k-gnome-control-center-3.18.2/share/icons/hicolor/icon-theme.cache /gnu/store/rzagmzgkx      gy0ri7vz0n9iq2rqv23abjk-xfdesktop-4.12.0/share/icons/hicolor/icon-theme.cache /gnu/store/ipmxr0yrz5anj4divjvh1dd6ahaa      p7lh-xfce4-session-4.12.0/share/icons/hicolor/icon-theme.cache /gnu/store/gjm2anhj5l2r80dppyyzlgkdh8wvsxr7-xfce4-puls      eaudio-plugin-0.2.3/share/icons/hicolor/icon-theme.cache /gnu/store/hrls9rixqa54bfllyx3jyw557gi3g8m8-xfce4-panel-4.12      .0/share/icons/hicolor/icon-theme.cache /gnu/store/q5drlyx99q8gcs5wjzjy8lws04f7vca4-xfce4-clipman-plugin-1.2.6/share/      icons/hicolor/icon-theme.cache /gnu/store/n1baflpvm635sys7k46z6ikfy8mwb4j4-xfce4-battery-plugin-1.0.5/share/icons/hic      olor/icon-theme.cache /gnu/store/fd5m7jaim990aawj6jmrrcmqvcf725v4-exo-0.10.3/share/icons/hicolor/icon-theme.cache /gn      u/store/lvgpbqkzhxi2gqn1616dn4bn9w801zgz-thunar-1.6.6/share/icons/hicolor/icon-theme.cache /gnu/store/2kazc8fpyl2qljw      h7k5k4ly9wd2swcxx-thunar-volman-0.8.1/share/icons/hicolor/icon-theme.cache /gnu/store/fpiwy6fy66k05qzian6ad8aby1k515w      a-libxfce4ui-4.12.0/share/icons/hicolor/icon-theme.cache /gnu/store/qpjgmxzqw9ag814h9bfjp5xip8lx0jyb-libpeas-1.16.0/s      hare/icons/hicolor/icon-theme.cache /gnu/store/fisva6qjdfqkls1pa6fm75x9dbshc5h2-inkscape-0.91/share/icons/hicolor/ico      n-theme.cache /gnu/store/5cck1dc4rcc0ibjd66jbm52gcgbzms1q-hexchat-2.10.1/share/icons/hicolor/icon-theme.cache /gnu/st      ore/jqhh2ymjgasv2ribjih25x0wvha8xakr-gnumeric-1.12.24/share/icons/hicolor/icon-theme.cache /gnu/store/8wvwgnrh6pjix8w      nqh5hkb35rpdmc7ny-gnucash-2.6.9/share/icons/hicolor/icon-theme.cache /gnu/store/44l39jivz88i4nav3sh5l5b4xchaawpc-gnub      ik-2.4.2/share/icons/hicolor/icon-theme.cache /gnu/store/g7xvxqv2hryyp5q0a4bsiq79s00irsqn-gnome-bluetooth-3.18.1/shar      e/icons/hicolor/icon-theme.cache /gnu/store/55frrjcdz9613ab3lr5m19p51bs1f13i-glade-3.18.3/share/icons/hicolor/icon-th      eme.cache /gnu/store/j3gxgcj9mm0wjhdh2wh2npw687l7par6-file-roller-3.16.4/share/icons/hicolor/icon-theme.cache /gnu/st      ore/z33lm37vxljj2sr1nz624mgi11qvpsfv-evince-3.18.1/share/icons/hicolor/icon-theme.cache /gnu/store/2sn7a2i3qphwyha2a1      gg66xyhnfcnajb-eog-3.18.1/share/icons/hicolor/icon-theme.cache /gnu/store/pdj08kkz81ds9lspr07jgss4l3rz81s7-devhelp-3.      18.1/share/icons/hicolor/icon-theme.cache /gnu/store/hpfpqlj5jliqn1cj7fmf83xais3ncizg-d-feet-0.3.10/share/icons/hicol      or/icon-theme.cache /gnu/store/6ayh80p58nfsl6hhgqzdrsnlbzlnxwfj-claws-mail-3.13.1/share/icons/hicolor/icon-theme.cach      e /gnu/store/k427449n43fg8rw2xbk2s68swdwchx6b-calf-0.0.60/share/icons/hicolor/icon-theme.cache /gnu/store/cnv5s2a0nzk      bf5vn90ic6881ji6lzrxv-brasero-3.12.1/share/icons/hicolor/icon-theme.cache /gnu/store/v2p4217whqya9vpm62d46gd9zk7pl1ly      -aisleriot-3.18.2/share/icons/hicolor/icon-theme.cache
   46 warning: arbitrarily choosing /gnu/store/892962rlrgjfflmh2z50wbcmcbcpki6i-rhythmbox-3.2.1/share/icons/hicolor/icon-th      eme.cache
   47 warning: collision encountered: /gnu/store/4d280gfqfkawjlmadshb2xw9kdbxx8jp-emacs-no-x-toolkit-24.5/share/emacs/24.5/      lisp/image.elc /gnu/store/mj85il1grwpsi8y19jas99d5sllcz875-emacs-no-x-24.5/share/emacs/24.5/lisp/image.elc /gnu/store      /j9pfpj2mdw7dha4w5qn75v2hxyq5x8ih-emacs-24.5/share/emacs/24.5/lisp/image.elc
   48 warning: arbitrarily choosing /gnu/store/4d280gfqfkawjlmadshb2xw9kdbxx8jp-emacs-no-x-toolkit-24.5/share/emacs/24.5/li      sp/image.elc
   49 warning: collision encountered: /gnu/store/4d280gfqfkawjlmadshb2xw9kdbxx8jp-emacs-no-x-toolkit-24.5/share/emacs/24.5/      etc/DOC /gnu/store/mj85il1grwpsi8y19jas99d5sllcz875-emacs-no-x-24.5/share/emacs/24.5/etc/DOC /gnu/store/j9pfpj2mdw7dh      a4w5qn75v2hxyq5x8ih-emacs-24.5/share/emacs/24.5/etc/DOC
   50 warning: arbitrarily choosing /gnu/store/4d280gfqfkawjlmadshb2xw9kdbxx8jp-emacs-no-x-toolkit-24.5/share/emacs/24.5/et      c/DOC

13000 lines clipped...

13985 warning: collision encountered: /gnu/store/wfvxxpdhnzd59vkad1zasm4f858giv9a-gcj-4.9.3/lib/libatomic.la /gnu/store      /rsgg9a3kwivqszsydvan8pbpdq9ivar5-gccgo-4.8.5/lib/libatomic.la /gnu/store/0bz73dnv3yyiff0fgph9c8lvjz919cl1-gcc-bo      otstrap-0/lib/libatomic.la
13986 warning: arbitrarily choosing /gnu/store/wfvxxpdhnzd59vkad1zasm4f858giv9a-gcj-4.9.3/lib/libatomic.la
13987 2354 packages in profile

Is that right?