I noticed that boost-1.32 appeared at http://download.fedora.redhat.com/pub/fedora/linux/core/development/SRPMS/ I also notice that it includes 2 patches, and only builds a single version of libs. I don't know if that's because it used: -sBUILD=release or because of this patch: Index: tools/build/v1/boost-base.jam =================================================================== RCS file: /cvsroot/boost/boost/tools/build/v1/boost-base.jam,v retrieving revision 1.129 diff -c -p -r1.129 boost-base.jam *** tools/build/v1/boost-base.jam 28 Jan 2004 22:50:17 -0000 1.129 --- tools/build/v1/boost-base.jam 1 Apr 2004 22:48:45 -0000 *************** rule common-variant-tag ( toolset varian *** 2621,2630 **** local version-tag = [ MATCH "^([^.]+).([^.]+)" : $(version-number[1]) ] ; version-tag = $(version-tag:J="_") ; ! tags += $(toolset-tag:J=) ; ! tags += $(thread-tag:J=) ; ! tags += $(runtime-tag:J=) ; ! tags += $(version-tag) ; if $(tags) { --- 2621,2630 ---- local version-tag = [ MATCH "^([^.]+).([^.]+)" : $(version-number[1]) ] ; version-tag = $(version-tag:J="_") ; ! # tags += $(toolset-tag:J=) ; ! # tags += $(thread-tag:J=) ; ! # tags += $(runtime-tag:J=) ; ! # tags += $(version-tag) ; if $(tags) { I'm wondering what this does. I'm not too concerned about just release, without debug, but what about threading single/multi? Did I get only single or only mt? Should I care?