I have Boost installed as part of my Fedora13/64-bit system, at Boost 1.41.<br>I now want install Boost 1.45, but need to keep the original around for backwards<br>compatibility issues, so I'm putting my 1.45 build somewhere else, and and I want<br> it look as much like the original 1.41 build as possible, but be 1.45.<br><br>So I built with this command<br><br><font size="1"><span style="font-family: courier new,monospace;">> ./bjam --prefix=/usr/local/boost_1_45_0 threading=single --runtime-link=shared --link=shared --layout=tagged install</span><br style="font-family: courier new,monospace;"> </font><br>then listing all the Boost regex (regex chosen at random) I find<br><br><font size="1"><span style="font-family: courier new,monospace;">> find /usr -name 'libboost_regex*'</span><br style="font-family: courier new,monospace;"> </font><br><font size="1"><span style="font-family: courier new,monospace;">187532��� 0 lrwxrwxrwx�� 1 root���� root���������� 24 Sep 21 16:25 /usr/lib64/libboost_regex.so -> libboost_regex.so.1.41.0</span><br style="font-family: courier new,monospace;"> <span style="font-family: courier new,monospace;">142821� 972 -rwxr-xr-x�� 1 root���� root������ 994792 Jun� 4� 2010 /usr/lib64/libboost_regex.so.1.41.0</span><br style="font-family: courier new,monospace;"><span style="font-family: courier new,monospace;">540038 2356 -rw-r--r--�� 1 root���� root����� 2410606 Jan 11 11:56 /usr/local/boost_1_45_0/lib/libboost_regex.a</span><br style="font-family: courier new,monospace;"> <span style="font-family: courier new,monospace;">540030 1132 -rwxr-xr-x�� 1 root���� root����� 1156757 Jan 11 11:55 /usr/local/boost_1_45_0/lib/libboost_regex.so.1.45.0</span><br style="font-family: courier new,monospace;"> <span style="font-family: courier new,monospace;">540031��� 0 lrwxrwxrwx�� 1 root���� root���������� 24 Jan 11 11:55 /usr/local/boost_1_45_0/lib/libboost_regex.so -> libboost_regex.so.1.45.0</span><br style="font-family: courier new,monospace;"> </font><br>which seems to show an extra .a compared to my Fedora 'default' installation.<br><br>How come?<br>Do I need it?<br>Can I determine the bjam flags that Fedora used originally?<br><br>Thx,<br><br>- Rob.<br> <br>