When compiling giac with nauty, I install nauty by hand and statically 
linked, nothing more than libnauty.a is required.
In configure.ac, the check is done by
AC_CHECK_LIB(nauty,main)
AC_CHECK_HEADERS(nauty/naututil.h)
I can of course add another check if it's required to compile with nauty, 
just let me know.

Le jeudi 5 novembre 2020 à 14:20:33 UTC+1, brucew...@gmail.com a écrit :

> Thx
>
> On Thu, 5 Nov 2020 at 10:32, Dima Pasechnik <dim...@gmail.com> wrote:
>
>> On Thu, Nov 5, 2020 at 10:08 AM brucew...@gmail.com
>> <brucew...@gmail.com> wrote:
>> >
>> > This is off-topic but I don't know the right place to ask this question 
>> about using git.
>> >
>> > I now have a detached HEAD at 9.3.beta0
>> >
>> > I tried "git checkout master" and got some hints and then
>> > fatal: 'master' matched multiple (2) remote tracking branches
>> >
>> > How do I get my develop branch back?
>>
>> git branch
>>
>> lists all the local branches you have
>>
>> Then
>>
>> git checkout foo # or whatever
>>
>> will put you back to your (local) branch foo
>>
>> You probably want to merge 9.3.beta0 into your "develop" branch.
>>
>> Do
>>
>> git checkout develop
>> git fetch trac develop # assuming "trac" is the name of git trac remote
>> git merge trac/develop
>>
>> (the latter two commands can be combined into "git pull trac develop")
>>
>> HTH
>> Dima
>>
>>
>> > On Wednesday, 4 November 2020 at 23:10:23 UTC brucew...@gmail.com 
>> wrote:
>> >>
>> >> I removed libnauty (which was actually libnauty2) did "make libnauty" 
>> then "make giac" and finally "make build".
>> >> It seems to have worked. That you all for your help and patience.
>> >>
>> >> On Wednesday, 4 November 2020 at 23:07:09 UTC dim...@gmail.com wrote:
>> >>>
>> >>> On Wed, Nov 4, 2020 at 10:00 PM Dima Pasechnik <dim...@gmail.com> 
>> wrote:
>> >>> >
>> >>> > On Wed, Nov 4, 2020 at 9:46 PM Matthias Koeppe <
>> matthia...@gmail.com> wrote:
>> >>> > >
>> >>> > > On Wednesday, November 4, 2020 at 11:29:17 AM UTC-8, 
>> brucew...@gmail.com wrote:
>> >>> > >>
>> >>> > >> "make giac" failed. I don't know why.
>> >>> > >>>
>> >>> > >>>
>> >>> > >
>> >>> > > From the log:
>> >>> > >
>> >>> > > /usr/bin/bash ../libtool --tag=CXX --mode=link g++ -std=gnu++11 
>> -g -O2 -fno-strict-aliasing -DGIAC_GENERIC_CONSTANTS -no-undefined 
>> -Wl,-rpath-link,/home/bruce/sage-8.9.beta1/local/lib 
>> -L/home/bruce/sage-8.9.beta1/local/lib 
>> -Wl,-rpath,/home/bruce/sage-8.9.beta1/local/lib -o icas icas.o libxcas.la 
>> -lreadline -lncurses -lcurl -lglpk -ldl -lm -lecm -lmpfi -lmpfr -lgmp 
>> -L/home/bruce/sage-8.9.beta1/local/lib -lgsl -lm -lopenblas -lm 
>> -L/home/bruce/sage-8.9.beta1/local/lib -lopenblas -lrt -lpthread -lnauty 
>> -lcurl -lglpk -ldl -lm -lecm -lmpfi -lmpfr -lgmp
>> >>> > > libtool: link: g++ -std=gnu++11 -g -O2 -fno-strict-aliasing 
>> -DGIAC_GENERIC_CONSTANTS -Wl,-rpath-link 
>> -Wl,/home/bruce/sage-8.9.beta1/local/lib -Wl,-rpath 
>> -Wl,/home/bruce/sage-8.9.beta1/local/lib -o .libs/icas icas.o 
>> -L/home/bruce/sage-8.9.beta1/local/lib ./.libs/libxcas.a 
>> /home/bruce/sage-8.9.beta1/local/var/tmp/sage/build/giac-1.5.0.87p2.p1/src/src/.libs/libgiac.so
>>  
>> -lntl -lpari -lreadline -lncurses -lgsl -lopenblas -lrt -lpthread -lnauty 
>> /usr/lib/x86_64-linux-gnu/libcurl.so -lglpk -ldl -lm -lecm -lmpfi -lmpfr 
>> -lgmp -pthread -Wl,-rpath -Wl,/home/bruce/sage-8.9.beta1/local/lib
>> >>> > > /usr/bin/ld: 
>> /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libnauty.so: 
>> undefined reference to `graph_free@CLIQUER_1'
>> >>> > > /usr/bin/ld: 
>> /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libnauty.so: 
>> undefined reference to `clique_unweighted_find_single@CLIQUER_1'
>> >>> > > /usr/bin/ld: 
>> /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libnauty.so: 
>> undefined reference to `graph_new@CLIQUER_1'
>> >>> > > collect2: error: ld returned 1 exit status
>> >>> > >
>> >>> > >
>> >>> > > Looks like the system libnauty is broken. What system is this? 
>> Try removing the libnauty system package
>> >>> >
>> >>> > it is "mostly" Ubuntu 20.10, so
>> >>> > 
>> https://ubuntu.pkgs.org/20.10/ubuntu-universe-arm64/libnauty2_2.7r1+ds-1_arm64.deb.html
>> >>> > - with an interesting dependency, libcliquer
>> >>> > Note that in Sage's configuration there is no such dependency, and
>> >>> > this might be the problem here, I guess
>> >>>
>> >>> yes, that's how it looks like from the config.log posted here. I
>> >>> suspect that it is a bug in giac, and
>> >>> one has to link with libcliquer here too (is libnauty underlinked?)
>> >>>
>> >>> >
>> >>> >
>> >>> > >
>> >>> > > --
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