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-rw-r--r--gnu/packages/maths.scm5
1 files changed, 4 insertions, 1 deletions
diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 0c51f6d54f..e432ed5c05 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -563,7 +563,10 @@ incompatible with HDF5.")
(inputs
`(("zlib" ,zlib)))
(arguments
- `(#:phases
+ `(;; Some of the users, notably Flann, need the C++ interface.
+ #:configure-flags '("--enable-cxx")
+
+ #:phases
(modify-phases %standard-phases
(add-before 'configure 'patch-configure
(lambda _