be explicit about gcc

boost/boost.spec

@@ -36,7 +36,7 @@ Class:        PLUS
 Group:        Language
 License:      Boost Software License
 Version:      %{V_openpkg}
-Release:      20160513
+Release:      20160515
 
 #   package options
 %option       with_debug     yes
@@ -49,8 +49,8 @@ Release:      20160513
 Source0:      http://download.sourceforge.net/boost/boost_%{V_dist}.tar.bz2
 
 #   build information
-BuildPreReq:  OpenPKG, openpkg >= 20140101, gcc, gcc::with_cxx = yes
-PreReq:       OpenPKG, openpkg >= 20140101
+BuildPreReq:  OpenPKG, openpkg >= 20160101, gcc, gcc::with_cxx = yes
+PreReq:       OpenPKG, openpkg >= 20160101
 %if "%{with_zlib}" == "yes"
 BuildPreReq:  zlib
 PreReq:       zlib
@@ -94,7 +94,8 @@ PreReq:       bzip2
         --exec-prefix=%{l_prefix} \
         --includedir=%{l_prefix}/include \
         --libdir=%{l_prefix}/lib \
-        --without-libraries=python
+        --without-libraries=python \
+        --with-toolset=gcc
 
     %{l_shtool} mkdir -p obj