fix build failure on powerpc

gsl-test.patch

@@ -0,0 +1,15 @@
+diff -up gsl-2.1/rstat/test.c.than gsl-2.1/rstat/test.c
+diff -up gsl-2.1/test/results.c.than gsl-2.1/test/results.c
+--- gsl-2.1/test/results.c.than	2016-03-10 18:08:17.013928401 -0500
++++ gsl-2.1/test/results.c	2016-03-10 18:42:45.717980023 -0500
+@@ -131,6 +131,10 @@ gsl_test_rel (double result, double expe
+     {
+       status = -1;
+     }
++  else if (fabs(result-expected) < relative_error)
++    {
++        status = 0;
++    }
+   else if (expected != 0 ) 
+     {
+       status = (fabs(result-expected)/fabs(expected) > relative_error) ;

gsl.spec

@@ -1,7 +1,7 @@
 Summary: The GNU Scientific Library for numerical analysis
 Name: gsl
 Version: 2.1
-Release: 3%{?dist}
+Release: 4%{?dist}
 URL: http://www.gnu.org/software/gsl/
 # info part of this package is under GFDL license
 # eigen/nonsymmv.c and eigen/schur.c
@@ -13,6 +13,7 @@ Source: ftp://ftp.gnu.org/gnu/gsl/%{name}-%{version}.tar.gz
 Patch0: gsl-1.10-lib64.patch
 # http://lists.gnu.org/archive/html/bug-gsl/2015-12/msg00012.html
 Patch1: gsl-tol.patch
+Patch2: gsl-test.patch
 BuildRequires: pkgconfig
 
 %description
@@ -35,6 +36,8 @@ developing programs using the GSL (GNU Scientific Library).
 %setup -q
 %patch0 -p1 -b .lib64
 %patch1 -p1 -b .tol
+%patch2 -p1 -b .test
+
 iconv -f windows-1252 -t utf-8 THANKS  > THANKS.aux
 touch -r THANKS THANKS.aux
 mv THANKS.aux THANKS
@@ -96,6 +99,9 @@ fi
 %{_mandir}/man3/*.3*
 
 %changelog
+* Thu Mar 10 2016 Than Ngo <than@redhat.com> - 2.1-4
+- fix build failure on powerpc
+
 * Fri Feb 26 2016 Dan Horák <dan[at]danny.cz> - 2.1-3
 - Disable FMA also on ppc64(le) and s390(x)