[flexiport/el6] Use cmake28 on el6

[rmattes]

commit 6e40c4918eb46de215c4cf4c58d59fe12ea333e2
Author: Rich Mattes <richmattes at gmail.com>
Date:   Tue Oct 16 01:10:43 2012 -0400

    Use cmake28 on el6

 flexiport.spec |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/flexiport.spec b/flexiport.spec
index 1264f41..f6fdbcf 100644
--- a/flexiport.spec
+++ b/flexiport.spec
@@ -12,7 +12,11 @@ Source0:        https://github.com/gbiggs/%{name}/tarball/1b6103da/gbiggs-%{name
 # Submitted upstream:
 # https://github.com/gbiggs/flexiport/issues/2
 Patch0:         flexiport-2.0.0-gcc47.patch
+%if 0%{?rhel}
+BuildRequires:  cmake28
+%else
 BuildRequires:  cmake
+%endif
 BuildRequires:  doxygen
 BuildRequires:  graphviz
 BuildRequires:  python-sphinx
@@ -39,7 +43,12 @@ sed -i 's/extensions/#extensions/' doc/conf.py.in
 sed -i 's/\"lib\"/\"%{_lib}\"/' CMakeLists.txt
 
 %build
-%cmake -DBUILD_EXAMPLES=OFF  .
+%if 0%{?rhel}
+%cmake28 \
+%else
+%cmake \
+%endif
+  -DBUILD_EXAMPLES=OFF  .
 make %{?_smp_mflags}