boost-jam: depends on boost-build, as suggested in by pancake (close #601).

srcpkgs/boost/template

@@ -1,7 +1,7 @@
 # Template file for 'boost'
 pkgname=boost
 version=1.54.0
-revision=4
+revision=5
 wrksrc="${pkgname}_${version//\./_}"
 makedepends="zlib-devel bzip2-devel icu-devel>=54"
 short_desc="Free peer-reviewed portable C++ source libraries"
@@ -65,6 +65,7 @@ if [ -z "$CROSS_BUILD" ]; then
 
 boost-jam_package() {
 	short_desc+=" - Boost.Jam utility"
+	depends="boost-build-${version}_${revision}"
 	pkg_install() {
 		vmove usr/bin/bjam
 	}
@@ -83,7 +84,6 @@ fi # !CROSS_BUILD
 boost-build_package() {
 	noarch=yes
 	conf_files="/etc/site-config.jam"
-	depends="boost-jam>=$version boost-devel>=$version"
 	short_desc+=" - Boost.Build framework"
 	pkg_install() {
 		vmove usr/share/boost-build