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-rw-r--r--gnu/packages/cpp.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/gnu/packages/cpp.scm b/gnu/packages/cpp.scm
index 00e006928e..45d3faeafb 100644
--- a/gnu/packages/cpp.scm
+++ b/gnu/packages/cpp.scm
@@ -334,7 +334,8 @@ as ordering relation.")
     (build-system cmake-build-system)
     (arguments
      '(#:configure-flags
-       (list (string-append "-DJSON_TestDataDirectory="
+       (list "-DJSON_MultipleHeaders=ON" ; For json_fwd.hpp.
+             (string-append "-DJSON_TestDataDirectory="
                             (assoc-ref %build-inputs "json_test_data")))
        #:phases (modify-phases %standard-phases
                   ;; XXX: When tests are enabled, the install phase will cause