boost: it's python_ver*sion* not python_ver

srcpkgs/boost/template

@@ -11,6 +11,7 @@ license="BSL-1.0"
 homepage="http://www.boost.org/"
 distfiles="https://dl.bintray.com/boostorg/release/${version}/source/boost_${version//./_}.tar.bz2"
 checksum=59c9b274bc451cf91a9ba1dd2c7fdcaf5d60b1b3aa83f2c9fa143417cc660722
+python_version=3
 
 CXXFLAGS="-std=c++14"
 
@@ -97,6 +98,7 @@ do_install() {
 boost-jam_package() {
 	short_desc+=" - Boost.Jam utility"
 	depends="boost-build>=${version}_${revision}"
+	python_version=3
 	pkg_install() {
 		vmove usr/bin/bjam
 		vmove usr/bin/b2
@@ -106,7 +108,7 @@ boost-python1.72_package() {
 	depends="boost python"
 	replaces="boost-python>=0"
 	short_desc+=" - Python bindings"
-	python_ver=2
+	python_version=2
 	pkg_install() {
 		vmove "usr/lib/libboost_python2*.so.*"
 	}