apparently mpfr needs a cygwin-specific patch:
https://cygwin.com/cgi-bin2/package-cat.cgi?file=x86_64%2Fmpfr%2Fmpfr-3.1.4-1-src&grep=mpfr
and it seems that Sage does not contain it.

(Sage/cygwin used to work, with an older mpfr, but then an update was done, 
without any cygwin-specific patches...)


On Saturday, March 26, 2016 at 2:06:19 PM UTC, Witold Żarowski wrote:
>
> I'm trying to install Sage on Windows 8.1/Cygwin.
> I'm getting the following error after make command (found in 
> mpfr-3.1.4.log):
> ===============================
> In file included from exceptions.c:23:0:
> mpfr-impl.h:261:4: error: #error "__unix__ is defined and __GMP_LIBGMP_DLL 
> is true"
>  #  error "__unix__ is defined and __GMP_LIBGMP_DLL is true"
>     ^
> mpfr-impl.h:264:4: error: #error "Both __unix__ and 
> MPFR_WIN_THREAD_SAFE_DLL are defined"
>  #  error "Both __unix__ and MPFR_WIN_THREAD_SAFE_DLL are defined"
>     ^
> ===============================
>
>

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