installing libffi-dev on the system and doing ./configure fixed the 
problem. Thanks !

Le jeudi 24 janvier 2019 13:45:37 UTC+1, E. Madison Bray a écrit :
>
> On Thu, Jan 24, 2019 at 9:40 AM <[email protected] <javascript:>> wrote: 
> > 
> > I have the same issue with libffi ! 
>
> I will look into that ASAP.  It's a similar / related problem to 
> https://trac.sagemath.org/ticket/26996 but affecting libffi.  The 
> install target for libffi might even depend on your compiler's 
> settings, which might explain why this didn't happen (at least that 
> I'm aware) on Debian-based distros where gcc does not install 
> libraries to ${prefix}/lib64. 
>
> Also, if you have your system's libffi-devel package installed and 
> it's recent enough, Sage's ./configure should detect it and skip 
> trying to install the libffi SPKG altogether. 
>
> > Le jeudi 24 janvier 2019 06:08:53 UTC+1, Steven Trogdon a écrit : 
> >> 
> >> Problem building libffi-3.2.1 on gentoo 
> >> 
> >> cp: cannot overwrite non-directory 
> '/64bitdev/storage/sage-git_develop/sage/local/./lib64' with directory 
> '/64bitdev/storage/sage-git_develop/sage/local/var/tmp/sage/build/libffi-3.2.1/inst/64bitdev/storage/sage-git_develop/sage/local/./lib64'
>  
>
> >> 
> ************************************************************************ 
> >> Error copying files for libffi-3.2.1. 
> >> 
> ************************************************************************ 
> >> 
> >> /64bitdev/storage/sage-git_develop/sage/local/./lib64 
> >> 
> >> is a symlink 
> >> 
> >> ls -al /64bitdev/storage/sage-git_develop/sage/local/./lib64 
> >> lrwxrwxrwx 1 strogdon math 3 Jan 13  2016 
> /64bitdev/storage/sage-git_develop/sage/local/./lib64 -> lib 
> >> 
> >> On Wednesday, January 23, 2019 at 2:47:49 PM UTC-6, Volker Braun wrote: 
> >>> 
> >>> As always, you can get the latest beta version from the "develop" git 
> branch. Alternatively, the self-contained source tarball is at 
> http://www.sagemath.org/download-latest.html 
> >>> 
> >>> 5389d8dc87 (tag: 8.7.beta0, trac/develop) Updated SageMath version to 
> 8.7.beta0 
> >>> 36ec29e57d Trac #26969: Misc pip upgrades 
> >>> 79cf5c980d Trac #27023: fix missing :: 
> >>> a4dd7deefc Trac #27020: OpenBLAS 0.3.5 
> >>> e60f32bb91 Trac #27017: Remove sage.schemes.elliptic_curves.padics 
> from documentation 
> >>> 4fb44bc920 Trac #27014: Deprecate sage.misc.misc.uniq 
> >>> c128368a45 Trac #27013: py3: some care for Hadamard matrices 
> >>> 6521233113 Trac #27010: py3: avoid .vertices() in methods 
> _ford_fulkerson, edge_cut, bounded_outdegree_orientation and gomory_hu_tree 
> >>> 58d9680bbe Trac #27009: py3: avoid sorting vertices and edges in 
> method treewidth 
> >>> 1ad58d2bb9 Trac #27008: py3: avoid .vertices() in method apex_vertices 
> >>> 010e1e893b Trac #27007: py3: avoid .vertices() in planarity.pyx 
> >>> c14dc9c46f Trac #27005: wrong libgap conversion for matrices over 
> QQ['x'] 
> >>> 7123d7504d Trac #27003: _iterator_weight should not sort 
> >>> 48484ef69d Trac #27002: autodoc: use __qualname__ on Python 3 
> >>> 57c5c40661 Trac #26999: 1 optional gurobi doctest failing 
> >>> ee7ed3c076 Trac #26998: py3 fix last 4 failing doctests in 
> combinat/posets 
> >>> 23f806cad2 Trac #26997: 5 internet doctests failing in findstat.py 
> >>> 0698bfb999 Trac #26995: Upgrade to Pynac-0.7.23 
> >>> 619281186a Trac #23222: Add test to EllipticCurve.isogeny() to check 
> for validity of kernel polynomials 
> >>> 4f560b02dc Trac #26988: py3: one tiny fix for isidentifier 
> >>> 90c3b31954 Trac #26985: some work on cluster mutation 
> >>> ee2d9c5657 Trac #26981: fix trac ticket number in deprecation warning 
> >>> 24186b661f Trac #26967: py3: some work on 
> modular/modform_hecketriangle/ 
> >>> 2f73854033 Trac #26958: Inheriting from MPolynomialRing_libsingular 
> crashes sage 
> >>> 319b7ac911 Trac #26943: Giac support for term orders and elimination 
> >>> 537b91840d Trac #26938: IncidenceStructure breaks if points cannot be 
> sorted 
> >>> 37065d12db Trac #26936: WordMorphism: domain/codomain should be 
> sortable if not given 
> >>> cdab354eeb Trac #26933: Subsets_s should support unsortable sets 
> >>> 6a818ec5e1 Trac #26917: py3: some fix in set_partition 
> >>> be09cc219f Trac #26864: Indentation error in Number Field 
> >>> a915a3ab1a Trac #26839: RealLazyField: converting constants in an 
> expression to float 
> >>> cefb74fd8c Trac #26834: pep8 cleaning in vertex_separation.pyx 
> >>> c6125397b3 Trac #26810: Permutations(avoiding=[[1,3,2]]) returns all 
> permutations 
> >>> 52633235e2 Trac #26809: Wrong contains in Permutations avoiding a 
> pattern 
> >>> 33ec2f8202 Trac #26516: Wrong sig_on_count in SharedMeatAxe 
> >>> faab330692 Trac #26361: Glucose SAT solver 
> >>> ce239b2e40 Trac #26183: doctest: tolerance parsing and ellipses 
> >>> 580c25bd1c Trac #26156: 0.0 is printed with too many digits 
> >>> ddfe6f3a20 Trac #25931: changes to partition for k combinat 
> >>> 08166d10a2 Trac #25900: Package libffi 
> >>> 35931ca890 Trac #25865: fast iterator for set partitions with given 
> block sizes 
> >>> 7aa39995c5 Trac #25480: Upgrade to cryptominisat 5.6.6 (and make it an 
> optional package again) 
> >>> 41153919eb Trac #25384: Let `sage --jupyter` call the Jupyter in Sage 
> >>> ec0b3f610b Trac #25147: Add DESTDIR support for boost_cropped 
> >>> a3ee80c6cb Trac #25143: Add DESTDIR support for pari 
> >>> 137ad44b65 Trac #25100: Add DESTDIR support for gfan, lcalc, 
> ratpoints, rubiks, symmetrica 
> >>> d8f5ab4875 Trac #18214: Bug in volume computation of polyhedron 
> >>> 9b3ae6af92 Trac #27024: update sagetex to version 3.2 
> >>> 4a7f20f562 Trac #26966: py3: new doctest failures in homology 
> >>> 3d09a80bb4 Trac #26962: Logarithm of rational numbers is broken 
> >>> d6f2242df4 Trac #26907: Exact division in ℤ[x][y] is broken 
> >>> 6abcb72592 (tag: 8.6, trac/master, sagemath/master) Updated SageMath 
> version to 8.6 
> >>> 
> > -- 
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