Makefile:901 error when I trying to compile gcc 5.1 on cygwin

[Martin Sebor]

> make[3] : on quitte le répertoire «
> /home/cov_flhe/src/gcc-5.1.0/i686-pc-cygwin/libquadmath »
> make[2] : on quitte le répertoire «
> /home/cov_flhe/src/gcc-5.1.0/i686-pc-cygwin/libquadmath »
> make[1] : on quitte le répertoire « /home/cov_flhe/src/gcc-5.1.0 »
> Makefile:901 : la recette pour la cible « all » a échouée
> make: *** [all] Erreur 2

The directories in the make[3] and [2] messages above look
like you might be building GCC in the source directory
(.../src/gcc-5.1.0) which is not recommended. If that's
the case, you might want to try the build again in a different
directory (see  https://gcc.gnu.org/wiki/FAQ#configure)

If not, as Jonathan said, you will need to try to find the
first error message in the log and figure out what it is
that caused the failure (or post it here).

Martin