[Patch] Provide single-precision fftw library for pulseaudio

[Eric Bavier]

Here's a patch to let pulseaudio use fftw for its equalizer.  It needs
an fftw that was configured using "--with-float", otherwise its
configure just prints "Package fftw3f was not found in the pkg-config
search path".

If the syntax could be improved, I'd like to hear about that.

>From 3bd90c044c687cdd93cca63e68664874f76b5edb Mon Sep 17 00:00:00 2001
From: Eric Bavier <address@hidden>
Date: Fri, 21 Mar 2014 14:06:40 -0500
Subject: [PATCH] gnu: Provide single-precision fftw library for pulseaudio

* gnu/packages/algebra.scm (fftwf): New variable
* gnu/packages/pulseaudio.scm (pulseaudio): Use it

* gnu/packages/algebra.scm
---
 gnu/packages/algebra.scm    |   12 +++++++++++-
 gnu/packages/pulseaudio.scm |    2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/algebra.scm b/gnu/packages/algebra.scm
index a1564e0..1c53f55 100644
--- a/gnu/packages/algebra.scm
+++ b/gnu/packages/algebra.scm
@@ -27,7 +27,8 @@
   #:use-module (guix licenses)
   #:use-module (guix packages)
   #:use-module (guix download)
-  #:use-module (guix build-system gnu))
+  #:use-module (guix build-system gnu)
+  #:use-module (guix utils))
 
 
 (define-public mpfrcx
@@ -231,3 +232,12 @@ transform (DFT) in one or more dimensions, of arbitrary 
input size, and of
 both real and complex data (as well as of even/odd data---i.e. the discrete
 cosine/ sine transforms or DCT/DST).")
     (license gpl2+)))
+
+(define-public fftwf
+  (package (inherit fftw)
+    (name "fftwf")
+    (arguments
+     `(,@(substitute-keyword-arguments (package-arguments fftw)
+           ((#:configure-flags cf)
+            `(cons "--enable-float"
+                   ,cf)))))))
\ No newline at end of file
diff --git a/gnu/packages/pulseaudio.scm b/gnu/packages/pulseaudio.scm
index db7e752..d82f4be 100644
--- a/gnu/packages/pulseaudio.scm
+++ b/gnu/packages/pulseaudio.scm
@@ -168,7 +168,7 @@ parse JSON formatted strings back into the C representation 
of JSON objects.")
        ("pkg-config" ,pkg-config)
        ("m4" ,m4)
        ("libtool" ,libtool)
-       ("fftw" ,fftw)
+       ("fftwf" ,fftwf)
        ("avahi" ,avahi)
        ("check" ,check)))
     (propagated-inputs
-- 
1.7.9.5

-- 
`~Eric