The tests/org-mode.scm tests expects 'jpl-outline-es' to be read as UTF-8. --- guile-present-0.3.0/tests/org-mode.scm 2014-09-23 22:29:51.426705753 +0200 +++ guile-present-0.3.0/tests/org-mode.scm 2014-09-23 22:30:09.634705548 +0200 @@ -194,9 +194,10 @@ "(Just another hacker)" "wingo@fluendo.com") (p "Julien Moutte, CEO" "julien@fluendo.com"))) + (with-fluids ((%default-port-encoding "UTF-8")) (call-with-input-file (in-vicinity *top-srcdir* "tests/jpl-outline-es") - org->presentation))) + org->presentation)))) (setlocale LC_ALL "") (exit-with-summary (run-all-defined-test-cases)) 8aa9e0e83c9bf26cc1d2bc594a8ce'/> Wojtek's customized Guix