retitle 35034 guile2.0-git rewrites libgit2 input to use guile-2.0 thanks It turns out that this problem is not specific to armhf. 'guile2.0-git' recently started failing to build on all Hydra-supported systems. I see now what's going on. The problem was introduced by: commit 03fb5ff6ae01a680c786d9ee148839543c519411 Author: Danny Milosavljevic Date: Thu Mar 21 23:28:43 2019 +0100 gnu: libgit2: Avoid Python. * gnu/packages/patches/libgit2-avoid-python.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/version-control.scm (libgit2)[source]: Use it. [inputs]: Remove python. [native-inputs]: Add guile-2.2. The 'guile-git' package has 'libgit2' as an input. The 'guile2.0-git' variant package uses 'package-for-guile-2.0' to rewrite 'guile-git' to use 'guile-2.0'. Unfortunately, this rewrites more deeply than we probably want. In this case, the rewriting extends into 'libgit2', changing its native-input from 'guile-2.2' to 'guile-2.0'. However, the Guile code that Danny wrote doesn't work with 'guile-2.0', because it uses the (ice-9 textual-ports) module, which doesn't exist in Guile 2.0. Suggestions? Mark