https://svn.boost.org/trac10/ticket/887 <pre class="wiki">CVS version checked out on Apr 5, 11:00AM EST. cygwin: 1.5.24(0.156/4/2) g++: 4.1.0 ran: $./configure --with-libraries=program_options $ ... &lt;nothing interesting&gt; $ make install ./tools/jam/src/bin.cygwinx86/bjam --user-config=user-config.jam --prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib --includedir=/usr/local/include --with-program_options install /boost/tools/build/v2/build/virtual-target.jam:996: in virtual-target.register-actual-name from module virtual-target error: Duplicate name of actual target: &lt;p/usr/local/lib&gt;exact.dll.a error: previous virtual target { common%common.hard-link-exact.dll.a.IMPORT_LIB { common%common.copy-boost_program_options-gcc41-mt-d-1_35.dll.a.IMPORT_LIB { gcc%gcc.link.dll-boost_program_options-gcc41-mt-d-1_35.dll.a.IMPORT_LIB { gcc%gcc.compile.c++-cmdline.o.OBJ { cmdline.cpp.CPP } } { gcc%gcc.compile.c++-config_file.o.OBJ { config_file.cpp.CPP } } { gcc%gcc.compile.c++-options_description.o.OBJ { options_description.cpp.CPP } } { gcc%gcc.compile.c++-parsers.o.OBJ { parsers.cpp.CPP } } { gcc%gcc.compile.c++-variables_map.o.OBJ { variables_map.cpp.CPP } } { gcc%gcc.compile.c++-value_semantic.o.OBJ { value_semantic.cpp.CPP } } { gcc%gcc.compile.c++-positional_options.o.OBJ { positional_options.cpp.CPP } } { gcc%gcc.compile.c++-utf8_codecvt_facet.o.OBJ { utf8_codecvt_facet.cpp.CPP } } { gcc%gcc.compile.c++-convert.o.OBJ { convert.cpp.CPP } } { gcc%gcc.compile.c++-winmain.o.OBJ { winmain.cpp.CPP } } } } } error: created from ./install-unversioned error: another virtual target { common%common.hard-link-exact.dll.a.IMPORT_LIB { common%common.copy-boost_program_options-gcc41-mt-1_35.dll.a.IMPORT_LIB { gcc%gcc.link.dll-boost_program_options-gcc41-mt-1_35.dll.a.IMPORT_LIB { gcc%gcc.compile.c++-cmdline.o.OBJ { cmdline.cpp.CPP } } { gcc%gcc.compile.c++-config_file.o.OBJ { config_file.cpp.CPP } } { gcc%gcc.compile.c++-options_description.o.OBJ { options_description.cpp.CPP } } { gcc%gcc.compile.c++-parsers.o.OBJ { parsers.cpp.CPP } } { gcc%gcc.compile.c++-variables_map.o.OBJ { variables_map.cpp.CPP } } { gcc%gcc.compile.c++-value_semantic.o.OBJ { value_semantic.cpp.CPP } } { gcc%gcc.compile.c++-positional_options.o.OBJ { positional_options.cpp.CPP } } { gcc%gcc.compile.c++-utf8_codecvt_facet.o.OBJ { utf8_codecvt_facet.cpp.CPP } } { gcc%gcc.compile.c++-convert.o.OBJ { convert.cpp.CPP } } { gcc%gcc.compile.c++-winmain.o.OBJ { winmain.cpp.CPP } } } } } error: created from ./install-unversioned error: added properties: &lt;debug-symbols&gt;off &lt;define&gt;NDEBUG &lt;inlining&gt;full &lt;optimization&gt;speed &lt;runtime-debugging&gt;off &lt;variant&gt;release error: removed properties: &lt;debug-symbols&gt;on &lt;inlining&gt;off &lt;optimization&gt;off &lt;runtime-debugging&gt;on &lt;variant&gt;debug /boost/tools/build/v2/build/virtual-target.jam:459: in actualize-no-scanner from module object(file-target)@27147 /boost/tools/build/v2/build/virtual-target.jam:111: in object(file-target)@27147.actualize from module object(file-target)@27147 /boost/tools/build/v2/build-system.jam:476: in load from module build-system /boost/tools/build/v2/kernel/modules.jam:261: in import from module modules /boost/tools/build/v2/kernel/bootstrap.jam:132: in boost-build from module /boost/boost-build.jam:9: in module scope from module </pre> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/887 Trac 1.4.3 Vladimir Prus Wed, 11 Jul 2007 14:18:23 GMT https://svn.boost.org/trac10/ticket/887#comment:1 https://svn.boost.org/trac10/ticket/887#comment:1 <ul> <li><strong>status</strong> <span class="trac-field-old">assigned</span> → <span class="trac-field-new">closed</span> </li> <li><strong>resolution</strong> <span class="trac-field-old">None</span> → <span class="trac-field-new">duplicate</span> </li> <li><strong>severity</strong> → <span class="trac-field-new">Showstopper</span> </li> </ul> <p> Duplicate of <a class="closed ticket" href="https://svn.boost.org/trac10/ticket/966" title="#966: Bugs: Install stage fails on Cygwin (closed: fixed)">#966</a>. </p> Ticket