Build only necessary boost stuff and force libstdc++ in benchmarklib.

benchmarklib/Makefile

 	# if [[ -f CMakeCache.txt ]]; then rm CMakeCache.txt; fi
 	dpkg -i boost/pkg/*.deb
 	pushd benchmarklib && \
-	CXX=$$(which c++) cmake -DSTATIC=1 -DBOOST_ROOT=/opt/cppse/build/boost -DCMAKE_INSTALL_PREFIX=$$PWD/benchmarklib_out . && \
+	CXX=$$(which c++) cmake -DSTATIC=1 -DBOOST_ROOT=/opt/cppse/build/boost -DCMAKE_INSTALL_PREFIX=$$PWD/benchmarklib_out -DNO_AUTO_USE_LIBCPP_CLANG=1 . && \
 	make -j $$(nproc) && \
 	make install
 

boost/Makefile

 	mkdir -p target && \
 	CXX=$$(which c++) ./bootstrap.sh --prefix=$$PWD/target/ --with-toolset=clang && \
 	./b2 clean && \
-	./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-D_GLIBCXX_USE_CXX11_ABI=0 -std=c++17" || true
+	./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-std=c++17 -stdlib=libstdc++" linkflags="-stdlib=libstdc++" --with-program_options \
+		--with-system \
+		--with-date_time \
+		--with-thread \
+		--with-chrono || true
+	# do not use -D_GLIBCXX_USE_CXX11_ABI=0 , other libs I now compile with libstdc++ don't do it either.
 	# with stdlib: \
 	#./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-D_GLIBCXX_USE_CXX11_ABI=0 -stdlib=libc++ -std=c++17" linkflags="-stdlib=libc++" || true
 	# without:
 	# ^ ||true because with clang I saw a few libraries not compile correctly, we can ignore those.
 	#./b2 --with-program_options --prefix=$$PWD/target/ toolset=clang cxxflags="-stdlib=libc++ -std=c++17" linkflags="-stdlib=libc++"
 
+	# also from; ./b2 --show-libraries && \
+	#- atomic
+	#- container
+	#- context
+	#- contract
+	#- coroutine
+	#- exception
+	#- fiber
+	#- filesystem
+	#- graph
+	#- graph_parallel
+	#- headers
+	#- iostreams
+	#- locale
+	#- log
+	#- math
+	#- mpi
+	#- nowide
+	#- python
+	#- random
+	#- regex
+	#- serialization
+	#- stacktrace
+	#- test
+	#- timer
+	#- type_erasure
+	#- wave
+
 package:
 	rm -rf out
 	mkdir -p out/opt/cppse/build/boost/include/