boost doesn't support DESTDIR or something like that,
hence, we need --prefix=$DESTDIR/usr.

However --prefix=$DESTDIR/usr adds $DESTDIR into
its cmake config. This patch strips $DESTDIR out
of cmake config
--- a/tools/boost_install/boost-install.jam
+++ b/tools/boost_install/boost-install.jam
@@ -678,6 +678,16 @@ local rule path-native-fwd ( path )
     return $(path) ;
 }
 
+local rule path-strip-destdir ( path )
+{
+    local parts = [ MATCH "^(/destdir(/[^/]+)?/boost-[0-9.]+)(/.*)" : $(path) ] ;
+    if $(parts)
+    {
+        path = $(parts[3]) ;
+    }
+    return $(path) ;
+}
+
 local rule get-dir ( name : dir )
 {
     if [ path.is-rooted $(dir) ]
@@ -756,6 +766,7 @@ rule generate-cmake-config- ( target : s
     if [ path.is-rooted $(cmakedir) ]
     {
         local cmakedir-native = [ path-native-fwd $(cmakedir) ] ;
+        cmakedir-native = [ path-strip-destdir $(cmakedir-native) ] ;
 
         print.text