[...]
successfully built /gnu/store/zlb8b35c3yd1bicfhlbsnr2nr3kimaln-guix-data-service-0.0.1-19.d1c243f.drv
[...]
;;; ./guix/ui.scm:1327:23: warning: possibly unbound variable `*line-width*'
successfully built /gnu/store/2yswvdj97wn47qiigyiri3h4qmgsy3gl-module-import-compiled.drv
building /gnu/store/h0wk170yfdxdky2na01pld5kl198y9kn-shepherd-dummy.scm.drv...
successfully built /gnu/store/h0wk170yfdxdky2na01pld5kl198y9kn-shepherd-dummy.scm.drv
building /gnu/store/5mfg66jm1fk049pi3jylksz7zb76244a-compute-guix-derivation.drv...
successfully built /gnu/store/5mfg66jm1fk049pi3jylksz7zb76244a-compute-guix-derivation.drv
[...]
guix build: error: profile contains conflicting entries for gitolite
guix build: error:   first entry: gitolite@3.6.7 /gnu/store/9r1ai9i9zc15svav6xmmlwin9qn0qh14-gitolite-3.6.7
guix build: error:   second entry: gitolite@3.6.7 /gnu/store/6w0cf968wad13jy73y8vgnlgzgc2hr0v-gitolite-3.6.7
hint: You cannot have two different versions or variants of `gitolite' in the
same profile.

Guix master commit 223e920abc023be91fe1e6747c599d547ad12bc5.