Get boost from git, the download tarball is unreliable.

boost/Makefile

@@ -1,8 +1,10 @@
 SHELL:=/bin/bash
 
-boost:
-	wget "https://dl.bintray.com/boostorg/release/1.72.0/source/boost_1_72_0.tar.bz2"
-	tar -xf boost_1_72_0.tar.bz2
+boost_:
+	# below URL is unreliable
+	# wget "https://dl.bintray.com/boostorg/release/1.72.0/source/boost_1_72_0.tar.bz2"
+	#tar -xf boost_1_72_0.tar.bz2
+	git clone --branch boost-1.73.0 --recursive https://github.com/boostorg/boost
 	bash ../ubuntu1804.sh make impl
 	make package
 
@@ -12,14 +14,14 @@ impl:
 	update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-10 40
 	update-alternatives --install /usr/bin/clang clang /usr/bin/clang-10 40
 	update-alternatives --install /usr/bin/ld ld /usr/bin/ld.lld-10 40
-	pushd boost_1_72_0 && \
+	pushd boost && \
 	mkdir -p target && \
 	CXX=$$(which c++) ./bootstrap.sh --prefix=$$PWD/target/ --with-toolset=clang && \
 	./b2 clean && \
-	# with stdlib:
+	./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-D_GLIBCXX_USE_CXX11_ABI=0 -std=c++17" || true
+	# with stdlib: \
 	#./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-D_GLIBCXX_USE_CXX11_ABI=0 -stdlib=libc++ -std=c++17" linkflags="-stdlib=libc++" || true
 	# without:
-	./b2 --prefix=$$PWD/target/ toolset=clang cxxflags="-D_GLIBCXX_USE_CXX11_ABI=0 -std=c++17" linkflags="" || true
 	#./b2 --prefix=$$PWD/target/ toolset=clang || true
 	# ^ ||true because with clang I saw a few libraries not compile correctly, we can ignore those.
 	#./b2 --with-program_options --prefix=$$PWD/target/ toolset=clang cxxflags="-stdlib=libc++ -std=c++17" linkflags="-stdlib=libc++"
@@ -27,13 +29,13 @@ impl:
 package:
 	rm -rf out
 	mkdir -p out/opt/cppse/build/boost/include/
-	cp -prv boost_1_72_0/stage/lib out/opt/cppse/build/boost/
-	cp -prv boost_1_72_0/boost out/opt/cppse/build/boost/include/
+	cp -prv boost/stage/lib out/opt/cppse/build/boost/
+	cp -prv boost/boost out/opt/cppse/build/boost/include/
 	rm -rf boost_*_amd64.deb
 	docker run -v "$$(pwd):/src/" rayburgemeestre/fpm-ubuntu:18.04 fpm -v 1.1 -s dir -t deb -n boost --license MPL2 --maintainer "Ray Burgemeestre <ray@cppse.nl>" --description "boost - build dependency" --url "https://github.com/liballeg/boost.git" --deb-generate-changes -C /src/out
 
 clean:
-	rm -rf boost_1_72_0
+	rm -rf boost
 	rm -rf out
 
 shell: