diff --git a/389-ds-base.spec b/389-ds-base.spec
index f9608c9..464d9c7 100644
--- a/389-ds-base.spec
+++ b/389-ds-base.spec
@@ -17,6 +17,9 @@
 %global use_tcmalloc 0
 %endif
 
+# Use Clang instead of GCC
+%global use_clang 0
+
 # fedora 15 and later uses tmpfiles.d
 # otherwise, comment this out
 %{!?with_tmpfiles_d: %global with_tmpfiles_d %{_sysconfdir}/tmpfiles.d}
@@ -30,7 +33,7 @@
 Summary:          389 Directory Server (base)
 Name:             389-ds-base
 Version:          1.4.0.1
-Release:          %{?relprefix}1%{?prerel}%{?dist}
+Release:          %{?relprefix}2%{?prerel}%{?dist}
 License:          GPLv3+
 URL:              http://www.port389.org
 Group:            System Environment/Daemons
@@ -50,7 +53,12 @@ BuildRequires:    cyrus-sasl-devel
 BuildRequires:    icu
 BuildRequires:    libicu-devel
 BuildRequires:    pcre-devel
+BuildRequires:    libatomic
+%if %{use_clang}
+BuildRequires:    clang
+%else
 BuildRequires:    gcc-c++
+%endif
 # The following are needed to build the snmp ldap-agent
 BuildRequires:    net-snmp-devel
 BuildRequires:    lm_sensors-devel
@@ -475,6 +483,10 @@ fi
 %{python3_sitelib}/*
 
 %changelog
+* Mon Oct 16 2017 Mark Reynolds <mreynolds@redhat.com> - 1.4.0.1-2
+- Bump version to 1.4.0.1-2
+- Ticket 49400 - Add clang support and libatomic
+
 * Mon Oct 9 2017 Mark Reynolds <mreynolds@redhat.com> - 1.4.0.1-1
 - Bump version to 1.4.0.1-1
 - Ticket 49038 - remove legacy replication - change cleanup script precedence