Add devsettool BR for EPEL

Signed-off-by: Jonathan Dieter <jdieter@gmail.com>

duperemove.spec

@@ -1,6 +1,6 @@
 Name:           duperemove
 Version:        0.11
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Tools for deduping file systems
 License:        GPLv2
 URL:            https://github.com/markfasheh/%{name}
@@ -12,6 +12,10 @@ BuildRequires:  libgcrypt-devel
 BuildRequires:  xxhash-devel
 BuildRequires:  libatomic
 BuildRequires:  gcc
+# Enable devtoolset so we get libatomic in EPEL
+%if 0%{?rhel} == 7
+BuildRequires:  devtoolset-7-toolchain, devtoolset-7-libatomic-devel
+%endif
 
 %description
 Duperemove is a simple tool for finding duplicated extents and
@@ -28,6 +32,9 @@ rm -f xxhash.c xxhash.h
 
 %build
 %set_build_flags
+%if 0%{?rhel}
+. /opt/rh/devtoolset-7/enable
+%endif
 %make_build
 
 %install
@@ -46,6 +53,9 @@ rm -f xxhash.c xxhash.h
 %{_sbindir}/show-shared-extents
 
 %changelog
+* Sat Oct 20 2018 Jonathan Dieter <jdieter@gmail.com> - 0.11-3
+- Add devsettool BR and build for EPEL
+
 * Fri Oct 19 2018 Jonathan Dieter <jdieter@gmail.com> - 0.11-2
 - Add missing BR
 - Fix build to use build flags