Bump boost to 1.72.0, let's see what happens.

boost/Makefile

@@ -1,8 +1,8 @@
 SHELL:=/bin/bash
 
 boost:
-	wget "https://dl.bintray.com/boostorg/release/1.68.0/source/boost_1_68_0.tar.bz2"
-	tar -xf boost_1_68_0.tar.bz2
+	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
 	bash ../ubuntu1804.sh make impl
 	make package
 
@@ -12,7 +12,7 @@ impl:
 	update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-7 40
 	update-alternatives --install /usr/bin/clang clang /usr/bin/clang-7 40
 	update-alternatives --install /usr/bin/ld ld /usr/bin/ld.lld-7 40
-	pushd boost_1_68_0 && \
+	pushd boost_1_72_0 && \
 	mkdir -p target && \
 	CXX=$$(which c++) ./bootstrap.sh --prefix=$$PWD/target/ --with-toolset=clang && \
 	./b2 clean && \
@@ -24,13 +24,13 @@ impl:
 package:
 	rm -rf out
 	mkdir -p out/opt/cppse/build/boost/include/
-	cp -prv boost_1_68_0/stage/lib out/opt/cppse/build/boost/
-	cp -prv boost_1_68_0/boost 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/
 	rm -rf boost_1.0_amd64.deb
 	docker run -v "$$(pwd):/src/" rayburgemeestre/fpm-ubuntu:18.04 fpm -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_68_0
+	rm -rf boost_1_72_0
 	rm -rf out
 
 shell: