David Coudert got that (on sage-devel I think). Turns out the libpng
install was broken for some reason and was missing libpng.so.
./sage -f libpng
solves this. But you are the second person reporting this which 
makes it suspicious. Is something out there deleting libpng.so?

François

> On 31/01/2018, at 01:34, Erik Bray <erik.m.b...@gmail.com> wrote:
> 
> On Sun, Jan 28, 2018 at 8:17 AM, Ralf Stephan <gtrw...@gmail.com> wrote:
>> This is https://trac.sagemath.org/ticket/24599
>> I'm trying now with the system gcc.
> 
> I don't have this problem on Ubuntu but I am getting:
> 
> [giac-1.4.9.45] libtool: link: g++ -g -O2 -fno-strict-aliasing
> -DGIAC_GENERIC_CONSTANTS -Wl,-rpath
> -Wl,/home/embray/src/sagemath/sage/local/lib -o .libs/icas icas.o
> -L/home/embray/src/sagemath/sage/local/lib ./.libs/libxcas.a
> /home/embray/src/sagemath/sage/local/var/tmp/sage/build/giac-1.4.9.45/src/src/.libs/libgiac.so
> -lntl -lpari -lreadline -lgsl -lgslcblas -lrt -lpthread -lglpk -ldl
> -lpng -lm -lmpfi /home/embray/src/sagemath/sage/local/lib/libmpfr.so
> -lgmp -Wl,-rpath -Wl,/home/embray/src/sagemath/sage/local/lib
> [giac-1.4.9.45]
> /home/embray/src/sagemath/sage/local/var/tmp/sage/build/giac-1.4.9.45/src/src/.libs/libgiac.so:
> undefined reference to `png_set_longjmp_fn'
> [giac-1.4.9.45] collect2: error: ld returned 1 exit status
> 
> 
> So this has rendered this beta unbuildable for me.
> 
> 
>> On Sun, Jan 28, 2018 at 8:09 AM François Bissey <frp.bis...@gmail.com>
>> wrote:
>>> 
>>> I was going to warn sage-on-gentoo users on this interesting fact that I
>>> experienced
>>> on the experimental branch where I track stuff that Volker merges.
>>> It is probably an issue in giac, but at the end of the day gcc needs to be
>>> rebuilt
>>> after mpfr/mpc. I didn’t think about the problem of what happens when you
>>> use
>>> the host gcc in vanilla sage though.
>>> You may have to build sage’s gcc - or use clang once support is merged :)
>>> 
>>> François
>>> 
>>>> On 28/01/2018, at 20:02, Ralf Stephan <gtrw...@gmail.com> wrote:
>>>> 
>>>> Compiling giac with the gcc installed by Sage (7.2.0) gives an internal
>>>> compiler error:
>>>> libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -DIN_GIAC -I. -I.. -I.
>>>> -I.. -I/h
>>>> ome/ralf/sage/local/include -g -O2 -I/home/ralf/sage/local/include
>>>> -I/home/ralf/
>>>> sage/local/include -fno-strict-aliasing -DGIAC_GENERIC_CONSTANTS -MT
>>>> solve.lo -M
>>>> D -MP -MF .deps/solve.Tpo -c solve.cc  -fPIC -DPIC -o .libs/solve.o
>>>> libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -DIN_GIAC -I. -I.. -I.
>>>> -I.. -I/h
>>>> ome/ralf/sage/local/include -g -O2 -I/home/ralf/sage/local/include
>>>> -I/home/ralf/
>>>> sage/local/include -fno-strict-aliasing -DGIAC_GENERIC_CONSTANTS -MT
>>>> derive.lo -
>>>> MD -MP -MF .deps/derive.Tpo -c derive.cc -o derive.o >/dev/null 2>&1
>>>> init2.c:52: MPFR assertion failed: p >= 2 && p <=
>>>> ((mpfr_prec_t)((mpfr_uprec_t)(
>>>> ~(mpfr_uprec_t)0)>>1))
>>>> modpoly.cc: In function 'std::complex<double> giac::horner_newton(const
>>>> vecteur&
>>>> , const std::complex<double>&, const giac::context*)':
>>>> modpoly.cc:5035:19: internal compiler error: Aborted
>>>>   complex<double> horner_newton(const vecteur & p,const
>>>> std::complex<double> &x
>>>> ,GIAC_CONTEXT){
>>>>                   ^~~~~~~~~~~~~
>>>> 0xafbc6f crash_signal
>>>>        ../../src/gcc/toplev.c:337
>>>> 0x7f3e0cfeedd3 mpfr_assert_fail
>>>> 
>>>> /home/ralf/sage/local/var/tmp/sage/build/mpfr-3.1.5.p0/src/src/mpfr-gmp.
>>>> c:305
>>>> 0x7f3e0cfe59c1 mpfr_init2
>>>> 
>>>> /home/ralf/sage/local/var/tmp/sage/build/mpfr-3.1.5.p0/src/src/init2.c:5
>>>> 2
>>>> 0x7f3e0d21b472 mpc_div_zero
>>>> 
>>>> /home/ralf/sage/local/var/tmp/sage/build/mpc-1.1.0/src/src/div.c:31
>>>> 0x7f3e0d21b472 mpc_div
>>>> 
>>>> /home/ralf/sage/local/var/tmp/sage/build/mpc-1.1.0/src/src/div.c:257
>>>> 0x77b6b9 do_mpc_arg2(tree_node*, tree_node*, tree_node*, int, int
>>>> (*)(__mpc_stru
>>>> ct*, __mpc_struct const*, __mpc_struct const*, int))
>>>>        ../../src/gcc/builtins.c:10179
>>>> 0x8afa0a const_binop
>>>>        ../../src/gcc/fold-const.c:1316
>>>> 0x8b0c5e const_binop(tree_code, tree_node*, tree_node*, tree_node*)
>>>>        ../../src/gcc/fold-const.c:1565
>>>> 0xdb4962 gimple_resimplify2(gimple**, code_helper*, tree_node*,
>>>> tree_node**, tre
>>>> e_node* (*)(tree_node*))
>>>>        ../../src/gcc/gimple-match-head.c:132
>>>> 0xe384b0 gimple_simplify(gimple*, code_helper*, tree_node**, gimple**,
>>>> tree_node
>>>> * (*)(tree_node*), tree_node* (*)(tree_node*))
>>>>        ../../src/gcc/gimple-match-head.c:642
>>>> 0x8e4306 fold_stmt_1
>>>>        ../../src/gcc/gimple-fold.c:4362
>>>> 0xbdb5ff execute
>>>>        ../../src/gcc/tree-ssa-forwprop.c:2391
>>>> Please submit a full bug report,
>>>> with preprocessed source if appropriate
>>>> 
>>>> The complete log is attached. System is OpenSuSE 42.3.
>>>> 
>>>> On Sun, Jan 28, 2018 at 1:08 AM Volker Braun <vbraun.n...@gmail.com>
>>>> 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
>>>> 
>>>> 0a674fd488 (tag: 8.2.beta4, trac/develop) Updated SageMath version to
>>>> 8.2.beta4
>>>> 4d966299d9 Trac #24581: more typos
>>>> 59b6f2aff8 Trac #24580: some typos (various)
>>>> 3e3b72af47 Trac #24592: "./sage -f" should clean first before building
>>>> the toolchain
>>>> e486b8d5b7 Trac #24586: packages whose type is "script" must have
>>>> executable spkg-install
>>>> dfa00046c8 Trac #24579: Don't install gfortran by default
>>>> 9396336c09 Trac #24570: py3: using the new tags py3 and py2 in some rst
>>>> files
>>>> d6c9aed908 Trac #24566: BooleanFunction evaluated on Integer computes
>>>> IndexError wrongly
>>>> cb4e6a68ce Trac #24548: py3: various details
>>>> d54fe681fd Trac #24487: add one example with picture to the doc of
>>>> list_plot3d
>>>> 7d56dfbec4 Trac #24174: Upgrade giac to 1.4.9-45
>>>> 35188851e1 Trac #23848: py3: some conversions from bytes to utf8
>>>> b5b1e208b4 Trac #22170: plot3d : the option "mesh=True" does not work in
>>>> Jupyter
>>>> 03a1d71600 Trac #19547: Document  options to hide labels in ToricPloter
>>>> 70e5eae8d3 Trac #2153: [with bundle, needs additional review] Defined
>>>> Hom parent of group homomorphisms.
>>>> 50e7153e59 Trac #24529: Upgrade some Jupyter packages
>>>> c44a86fc1e Trac #24512: fix plotting of WheelGraph(n) for n<4
>>>> ab59b8df29 Trac #24574: p3  : get rid of __cmp__ for words
>>>> 0d5f9274c1 Trac #24572: py3: some more care for map
>>>> 13585a4c7e Trac #24569: py3 : caring for range again
>>>> 2a38ead995 Trac #24558: exception when creating tensor product
>>>> c4dcef94e0 Trac #24565: small cleanup of abstract tree
>>>> 115b43f467 Trac #23418: put number fields in Fields().Infinite()
>>>> 34050d596a Trac #24556: py3: fix raise StopIteration in generator
>>>> statements
>>>> 269c40171d Trac #24538: Add Africa map graph
>>>> 617db2f540 Trac #24106: Install packages in temporary root before
>>>> copying to $SAGE_LOCAL (simplified)
>>>> 03e2e86cb2 Trac #10017: reduced_basis for number field multiples wrong
>>>> 533ef23605 Trac #24539: fraction_field: missing format in exception
>>>> 180d79f92f Trac #24493: graphs.SymplecticGraph() and deprecation
>>>> 9626e1e282 Trac #24550: py3: very minor fixes for sage.interfaces.tests
>>>> 5b64807c94 Trac #3313: Add code to lift SLm(Z/NZ) to SLm(Z) (also for m
>>>> not equal 2)
>>>> 86e7e4ae45 Trac #24560: direct access to m-Tamari lattices
>>>> 5e8e9189d5 Trac #24552: py3: adding a few __hash__ function
>>>> bd54574854 Trac #24549: Clean up MPC declarations
>>>> 49bc8d751a Trac #24546: get rid of some builtins import
>>>> 29160c0b49 Trac #24545: lazy import in lfunctions
>>>> 4222b3010d Trac #24540: add q-Stirling numbers (of first type)
>>>> 65b3a61326 Trac #24514: py3: Fix ntl_GF2X.__hex__
>>>> 0cfb1a8094 Trac #24497: Upgrade to pynac-0.7.15
>>>> 097adebeb6 Trac #24475: str_to_bytes() should accept unicode
>>>> 9c9a025007 Trac #24451: Polyhedron.get_integral_point
>>>> 334a31b611 Trac #24353: Upgrade MPFR, MPC and MPFI
>>>> 5502506514 Trac #24258: py3: support <type '...'> expected output in
>>>> doctests on Python 3
>>>> dadd0f00e3 Trac #23555: Bounding box bug in Polyhedron plots
>>>> 2b2c3eaf7f Trac #23106: Python scripts in src/bin are not ready for Sage
>>>> + Python 3
>>>> a4bc0cecfd Trac #23037: Implement representations for Virasoro algebra
>>>> fc56cd7b14 Trac #22087: New function richcmp_item
>>>> 56a4bc7e76 (tag: 8.2.beta3) Updated SageMath version to 8.2.beta3
>>>> 
>>>> 
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>>>> <giac-1.4.9.45.log>
>>> 
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