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-rw-r--r--gnu/packages/calendar.scm1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnu/packages/calendar.scm b/gnu/packages/calendar.scm
index 129eb58aa0..fa55822762 100644
--- a/gnu/packages/calendar.scm
+++ b/gnu/packages/calendar.scm
@@ -50,6 +50,7 @@
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages python)
+  #:use-module (gnu packages python-build)
   #:use-module (gnu packages python-xyz)
   #:use-module (gnu packages qt)
   #:use-module (gnu packages sphinx)