So the error seems to be coming from this command:

> building 'sage.schemes.elliptic_curves.descent_two_isogeny' extension
> /usr/local/gcc-4.4.1-sun-linker/bin/gcc -fno-strict-aliasing -DNDEBUG -g -O3
> -Wall -Wstrict-prototypes -fPIC
> -I/export/home/drkirkby/sage-4.3.1.rc0/local/include/FLINT/
> -I/export/home/drkirkby/sage-4.3.1.rc0/local//include
> -I/export/home/drkirkby/sage-4.3.1.rc0/local//include/csage
> -I/export/home/drkirkby/sage-4.3.1.rc0/devel//sage/sage/ext
> -I/export/home/drkirkby/sage-4.3.1.rc0/local/include/python2.6 -c
> sage/schemes/elliptic_curves/descent_two_isogeny.c -o
> build/temp.solaris-2.10-sun4u-2.6/sage/schemes/elliptic_curves/descent_two_isogeny.o
> -std=c99

And it's an explicit #error in a header file:

> In file included from /usr/include/limits.h:18,
>                 from
> /usr/local/gcc-4.4.1-sun-linker/bin/../lib/gcc/sparc-sun-solaris2.10/4.4.1/include-fixed/limits.h:122,
>                 from
> /usr/local/gcc-4.4.1-sun-linker/bin/../lib/gcc/sparc-sun-solaris2.10/4.4.1/include-fixed/syslimits.h:7,
>                 from
> /usr/local/gcc-4.4.1-sun-linker/bin/../lib/gcc/sparc-sun-solaris2.10/4.4.1/include-fixed/limits.h:11,
>                 from
> /export/home/drkirkby/sage-4.3.1.rc0/local/include/python2.6/Python.h:19,
>                 from sage/schemes/elliptic_curves/descent_two_isogeny.c:4:
> /usr/local/gcc-4.4.1-sun-linker/bin/../lib/gcc/sparc-sun-solaris2.10/4.4.1/include-fixed/sys/feature_tests.h:341:2:
> error: #error "Compiler or options invalid for pre-UNIX 03 X/Open
> applications    and pre-2001 POSIX applications"
>

Can you look in that header file, and see what preprocessor tests are
being done that cause it to get included? (Was this on a machine that
we have access to, like t2?)

-cc
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