<div dir="auto">The missing symbols you quoted come from python itself. It looks like you're missing a "-lpython" linker flag.<div dir="auto"><br></div><div dir="auto">Regards, </div><div dir="auto">Nathan</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 19, 2021, 4:47 AM Roy de Bokx via Boost-users <<a href="mailto:boost-users@lists.boost.org">boost-users@lists.boost.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Op wo 17 feb. 2021 om 20:30 schreef Anonymous Maarten <<a href="mailto:anonymous.maarten@gmail.com" target="_blank" rel="noreferrer">anonymous.maarten@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div dir="auto"></div></div></blockquote><div>Thanks for your answer Maarten!</div><div>Please bare with me as I'm a little new to this. Is there some way I can change the interpreter that is used for installing boost? Or do you think that adapting the --prefix flag may also work? </div></div></div></blockquote><div> </div><div>When using the pre-built boost packages of a linux distribution (ubuntu), you're generally stuck with the versions/options that its packagers have chosen.</div><div>A distribution freezes versions to make a more robust experience.</div><div><br></div><div>Adding a `--prefix` will not help because, first of all, it's not a valid gcc option, and second, ubuntu 18.04 does not provide a libboost-python-py37 shared/static library.</div><div>Do you really need python 3.7? Doesn't 3.6 suffice?<br></div></div></div></blockquote><div><br></div><div>Thanks! This helped me understanding the issue a bit further. I think 3.6 should suffice indeed, so I tried using 3.6 by removing the 3.7 installation from the Dockerfile and using the -lboost_numpy3 flag instead.</div><div>It seems I ran into some linking issue after this. It was able to find the right numpy3.so and libboost_python3-py36.so, but I'm getting a lot of errors like these:</div><div> <p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(252,33,24)"><span style="font-variant-ligatures:no-common-ligatures">//usr/lib/x86_64-linux-gnu/libboost_numpy3.so: undefined reference to `PyExc_ValueError'</span></p> <p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(252,33,24)"><span style="font-variant-ligatures:no-common-ligatures">//usr/lib/x86_64-linux-gnu/libboost_python3-py36.so.1.65.1: undefined reference to `PyLong_AsLong'</span></p> <p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(252,33,24)"><span style="font-variant-ligatures:no-common-ligatures">//usr/lib/x86_64-linux-gnu/libboost_python3-py36.so.1.65.1: undefined reference to `PyNumber_InPlaceFloorDivide'</span></p> <p style="margin:0px;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(252,33,24)"><span style="font-variant-ligatures:no-common-ligatures">//usr/lib/x86_64-linux-gnu/libboost_python3-py36.so.1.65.1: undefined reference to `PyBool_Type'</span></p></div><div>etc...</div><div><br></div><div>I've pasted the full docker file and logs in <a href="https://github.com/boostorg/boost/issues/462" target="_blank" rel="noreferrer">https://github.com/boostorg/boost/issues/462</a></div><div>Thanks again for any help.</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div></div><div><br></div><div>If you really want to use Boost.Python + python 3.7, you can do 2 things:</div><div>- stay on ubuntu bionic and build boost yourself (or use an alternative c/c++ package manager, e.g. [conan](<a href="https://conan.io/" target="_blank" rel="noreferrer">https://conan.io/</a>) has a [boost package](<a href="https://conan.io/center/boost" target="_blank" rel="noreferrer">https://conan.io/center/boost</a>))</div><div>- more to a more recent ubuntu release. e.g. ubuntu 20.10 has python 3.8: <a href="https://packages.ubuntu.com/groovy/amd64/libboost-python1.71-dev/filelist" target="_blank" rel="noreferrer">https://packages.ubuntu.com/groovy/amd64/libboost-python1.71-dev/filelist</a></div></div></div></blockquote><div>I've also given 20.10 a try, however I ran into the same linking issues as mentioned above. </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div><br></div><div> </div><br></div></div> </blockquote></div></div> _______________________________________________<br> Boost-users mailing list<br> <a href="mailto:Boost-users@lists.boost.org" target="_blank" rel="noreferrer">Boost-users@lists.boost.org</a><br> <a href="https://lists.boost.org/mailman/listinfo.cgi/boost-users" rel="noreferrer noreferrer" target="_blank">https://lists.boost.org/mailman/listinfo.cgi/boost-users</a><br> </blockquote></div>