diff --git a/boost.spec b/boost.spec
index b6244f4a5d312be671440a30f902e836d98b396c..c0482b407fed2b746ec57ea0bce0e4d4c94dc3ef 100644
--- a/boost.spec
+++ b/boost.spec
@@ -9,7 +9,7 @@
 
 Name:           boost
 Version:        1.78.0
-Release:        2
+Release:        3
 Summary:        The free peer-reviewed portable C++ source libraries
 License:        Boost Software License 1.0
 URL:            http://www.boost.org
@@ -548,12 +548,14 @@ using python : %{python3_version} : /usr/bin/python3 : /usr/include/python%{pyth
 EOF
 
 ./bootstrap.sh --with-toolset=gcc --with-icu
+%define opt_build -d+2 -q %{?_smp_mflags} --no-cmake-config
+%define opt_feature variant=release threading=multi debug-symbols=on pch=off
+%define opt_python python=%{python3_version}
+%define b2_options %{opt_build} %{opt_feature} %{opt_python}
 
 echo ============================= build serial ==================
-./b2 -d+2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
   --without-mpi --without-graph_parallel --build-dir=serial \
-  variant=release threading=multi debug-symbols=on pch=off \
-    python=%{python3_version} \
   stage
 
 %if %{with openmpi} || %{with mpich}
@@ -564,10 +566,9 @@ module purge ||:
 %{_openmpi_load}
 
 echo ============================= build $MPI_COMPILER ==================
-./b2 -d+2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
     --with-mpi --with-graph_parallel --build-dir=$MPI_COMPILER \
-    variant=release threading=multi debug-symbols=on pch=off \
-    python=%{python3_version} stage
+    stage
 
 %{_openmpi_unload}
 export PATH=/bin${PATH:+:}$PATH
@@ -577,10 +578,9 @@ export PATH=/bin${PATH:+:}$PATH
 %{_mpich_load}
 
 echo ============================= build $MPI_COMPILER ==================
-./b2 -d+2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
     --with-mpi --with-graph_parallel --build-dir=$MPI_COMPILER \
-    variant=release threading=multi debug-symbols=on pch=off \
-    python=%{python3_version} stage
+    stage
 
 %{_mpich_unload}
 export PATH=/bin${PATH:+:}$PATH
@@ -603,11 +603,10 @@ module purge ||:
 %{_openmpi_load}
 
 echo ============================= install $MPI_COMPILER ==================
-./b2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
   --with-mpi --with-graph_parallel --build-dir=$MPI_COMPILER \
   --stagedir=${RPM_BUILD_ROOT}${MPI_HOME} \
-  variant=release threading=multi debug-symbols=on pch=off \
-  python=%{python3_version} stage
+  install
 
 mkdir -p ${RPM_BUILD_ROOT}%{python3_sitearch}/openmpi/boost
 touch ${RPM_BUILD_ROOT}%{python3_sitearch}/openmpi/boost/__init__.py
@@ -616,7 +615,6 @@ mv ${RPM_BUILD_ROOT}${MPI_HOME}/lib/boost-python%{python3_version}/mpi.so \
 
 rm -f ${RPM_BUILD_ROOT}${MPI_HOME}/lib/libboost_{python,{w,}serialization}*
 rm -f ${RPM_BUILD_ROOT}${MPI_HOME}/lib/libboost_numpy*
-rm -r ${RPM_BUILD_ROOT}${MPI_HOME}/lib/cmake
 
 %{_openmpi_unload}
 export PATH=/bin${PATH:+:}$PATH
@@ -626,11 +624,10 @@ export PATH=/bin${PATH:+:}$PATH
 %{_mpich_load}
 
 echo ============================= install $MPI_COMPILER ==================
-./b2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
   --with-mpi --with-graph_parallel --build-dir=$MPI_COMPILER \
   --stagedir=${RPM_BUILD_ROOT}${MPI_HOME} \
-  variant=release threading=multi debug-symbols=on pch=off \
-  python=%{python3_version} stage
+  install
 
 mkdir -p ${RPM_BUILD_ROOT}%{python3_sitearch}/mpich/boost
 touch ${RPM_BUILD_ROOT}%{python3_sitearch}/mpich/boost/__init__.py
@@ -639,23 +636,18 @@ mv ${RPM_BUILD_ROOT}${MPI_HOME}/lib/boost-python%{python3_version}/mpi.so \
 
 rm -f ${RPM_BUILD_ROOT}${MPI_HOME}/lib/libboost_{python,{w,}serialization}*
 rm -f ${RPM_BUILD_ROOT}${MPI_HOME}/lib/libboost_numpy*
-rm -r ${RPM_BUILD_ROOT}${MPI_HOME}/lib/cmake
 
 %{_mpich_unload}
 export PATH=/bin${PATH:+:}$PATH
 %endif
 
 echo ============================= install serial ==================
-./b2 -d+2 -q %{?_smp_mflags} \
+./b2 %{b2_options} \
   --without-mpi --without-graph_parallel --build-dir=serial \
   --prefix=$RPM_BUILD_ROOT%{_prefix} \
   --libdir=$RPM_BUILD_ROOT%{_libdir} \
-  variant=release threading=multi debug-symbols=on pch=off \
-    python=%{python3_version} \
   install
 
-rm -r $RPM_BUILD_ROOT/%{_libdir}/cmake
-
 version=%{version}
 
 echo ============================= install Boost.Build ==================
@@ -964,6 +956,9 @@ fi
 %{_mandir}/man1/bjam.1*
 
 %changelog
+* Sun Dec 19 2021 sdlzx <sdlzx@163.com> - 1.78.0-3
+- Simplify spec: extract common b2 configs into b2_config
+
 * Fri Dec 10 2021 sdlzx <sdlzx@163.com> - 1.78.0-2
 - Simplify spec: remove useless bcond