[PATCH] gnu: fftw: Build threads library.

[Ricardo Wurmus]

* gnu/packages/algebra.scm (fftw)[arguments]: Add "--enable-threads" to
configure flags.
---
 gnu/packages/algebra.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/algebra.scm b/gnu/packages/algebra.scm
index 8e9695d..e212775 100644
--- a/gnu/packages/algebra.scm
+++ b/gnu/packages/algebra.scm
@@ -544,7 +544,8 @@ a C program.")
                "1kwbx92ps0r7s2mqy7lxbxanslxdzj7dp7r7gmdkzv1j8yqf3kwf"))))
     (build-system gnu-build-system)
     (arguments
-     '(#:configure-flags '("--enable-shared" "--enable-openmp")
+     '(#:configure-flags
+       '("--enable-shared" "--enable-openmp" "--enable-threads")
        #:phases (alist-cons-before
                  'build 'no-native
                  (lambda _
-- 
2.10.1