Thanks for the prompt reply. I tried your suggestion but it failed. Here's
the screen capture form it:
make build/make/Makefile --stop
make[1]: Entering directory `/home/leo/mysagemath/SageMath'
rm -f config.log
mkdir -p logs/pkgs
ln -s logs/pkgs/config.log config.log
running CONFIG_SHELL=/bin/bash /bin/bash ./configure --no-create
--no-recursion
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... yes
checking for root user... no
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking for ar... yes
checking for m4... yes
checking for ranlib... yes
checking for strip... yes
checking for GNU or BSD tar... /bin/tar
checking for GNU make... /usr/bin/make
checking for latex... yes
checking for perl... /usr/bin/perl
checking for Perl version 5.8.0 or later... yes
checking for git... no
checking for yasm... no
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of gcc... none
checking how to run the C preprocessor... gcc -E
checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... no
checking for cxx... no
checking for cc++... no
checking for cl.exe... no
checking for FCC... no
checking for KCC... no
checking for RCC... no
checking for xlC_r... no
checking for xlC... no
checking whether we are using the GNU C++ compiler... no
checking whether g++ accepts -g... no
checking dependency style of g++... none
checking for gfortran... gfortran
checking whether we are using the GNU Fortran compiler... yes
checking whether gfortran accepts -g... yes
checking for C compiler vendor... gnu
checking for gcc... gcc
checking whether we are using the GNU Objective C compiler... no
checking whether gcc accepts -g... no
checking dependency style of gcc... none
checking for g++... no
checking for objc++... no
checking for objcxx... no
checking for c++... no
checking for CXX... no
checking whether we are using the GNU Objective C++ compiler... no
checking whether g++ accepts -g... no
checking dependency style of g++... none
checking for curl 7.22... no
checking how to run the C++ preprocessor... /lib/cpp
configure: error: in `/home/leo/mysagemath/SageMath':
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details
If you would like to try to build Sage anyway (to help porting),
export the variable 'SAGE_PORT' to something non-empty.
make[1]: *** [build/make/Makefile] Error 1
make[1]: Leaving directory `/home/leo/mysagemath/SageMath'
make: *** [all-toolchain] Error 2


On 15 August 2018 at 16:00, Dima Pasechnik <dimp...@gmail.com> wrote:

> one can see in your log:
>
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xe1 in position 16:
> ordinal not in range(128)
>
> this suggests non-ascii chars in some of your paths, or something
> "interesting" with your locale.
>
> Can you try running
>
> LC_ALL=C ./sage -i pip
>
> to see if this succeeds.
>
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