I see the problem.  Originally, Sage (or you) decided to install the GCC
package within Sage.  As a consequence, MPIR was built without the C++
interface.  From the MPIR log:
> Building a reduced version of MPIR to bootstrap GCC.
> MPIR will later get rebuilt (with the C++ interface and static libraries
> enabled) using the new compiler.
Then MPFR failed, causing the build to abort.  Then you messed with
CFLAGS (and maybe compiler versions?) and rebuilt Sage but this time
*without* installing GCC.  This left the "partial" MPIR build in place.

Rebuilding MPIR should fix your problem.

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