do not require the hostname package when being built on RHEL-6

zsh.spec

@@ -3,7 +3,7 @@
 Summary: Powerful interactive shell
 Name: zsh
 Version: 5.3.1
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: MIT
 URL: http://zsh.sourceforge.net/
 Group: System Environment/Shells
@@ -21,7 +21,6 @@ Patch0: zsh-serial.patch
 
 BuildRequires: coreutils
 BuildRequires: gawk
-BuildRequires: hostname
 BuildRequires: libcap-devel
 BuildRequires: ncurses-devel
 BuildRequires: sed
@@ -31,6 +30,11 @@ Requires(post): info grep
 Requires(preun): info
 Requires(postun): coreutils grep
 
+# the hostname package is not available on RHEL-6
+%if 12 < 0%{?fedora} || 6 < 0%{?rhel}
+BuildRequires: hostname
+%endif
+
 Provides: /bin/zsh
 
 %description
@@ -159,6 +163,9 @@ fi
 %doc Doc/*.html
 
 %changelog
+* Thu Dec 22 2016 Kamil Dudka <kdudka@redhat.com> - 5.3.1-2
+- do not require the hostname package when being built on RHEL-6
+
 * Wed Dec 21 2016 Kamil Dudka <kdudka@redhat.com> - 5.3.1-1
 - Update to latest upstream release: Zsh 5.3.1