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-rw-r--r--gnu/packages/astronomy.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index 2695530fee..9f5e4aeb78 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -143,6 +143,7 @@ programs for the manipulation and analysis of astronomical data.")
         #:phases (modify-phases %standard-phases
                    (add-before 'check 'set-offscreen-display
                      (lambda _
+                       ;; make Qt render "offscreen", required for tests
                        (setenv "QT_QPA_PLATFORM" "offscreen")
                        (setenv "HOME" "/tmp")
                        #t)))))