From 7c473f3cccab29c4581c97d41770e4aa3c67eab3 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Mon, 13 Jul 2015 17:21:52 +0200
Subject: configure: Add --with-fftw

---
 configure.ac | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5086459c..87f84f76 100644
--- a/configure.ac
+++ b/configure.ac
@@ -276,14 +276,22 @@ AC_CHECK_LIB([rt], [clock_gettime],
    AC_MSG_WARN([Time intervals may not be correct in certain circumstances.])
 ])
 
-
-PKG_CHECK_MODULES([FFTW], [fftw3],
+AC_ARG_WITH(fftw,
+[AS_HELP_STRING([--with-ffftw],
+                [specify location of FFTW (instead of using pkg-config)])],
+[FFTW_CFLAGS="-I$withflag/include"
+ FFTW_LIBS="-L$withval/lib -L$withval/lib64 -lfftw3"
+ have_fftw=true],
+[PKG_CHECK_MODULES([FFTW], [fftw3],
 [
    have_fftw=true
-   AC_DEFINE([HAVE_FFTW], [1], [Define to 1 if FFTW is available])
 ], [
    AC_MSG_WARN([asdf indexing wil not be available.])
    have_fftw=false
+])])
+AS_IF([test x$have_fftw = xtrue],
+[
+   AC_DEFINE([HAVE_FFTW], [1], [Define to 1 if FFTW is available])
 ])
 
 AX_WITH_CURSES
-- 
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