OK, here is the synposis:

Run the configure with:

$ CFLAGS="-O3 -m64 -mcpu=ultrasparc -L/opt/lib/sparcv9 -R/opt/lib/sparcv9" \
CXXFLAGS="-O3 -m64 -mcpu=ultrasparc -L/opt/lib/sparcv9 -R/opt/lib/sparcv9" \
LDFLAGS="-m64 -L/opt/lib/sparcv9 -R/opt/lib/sparcv9" \
./configure --prefix=/opt \
--enable-shared \
--libdir=/opt/lib/sparcv9


$ make

gcc -pthread -c -fno-strict-aliasing -DNDEBUG    -I. -I./Include  -fPIC -DPy_BUILD_CORE -o Modules/python.o ./Modules/python.c
In file included from ./Include/Python.h:57,
                 from ./Modules/python.c:3:
./Include/pyport.h:730:2: error: #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."

----

Cause:

Makefile.pre.in does not have substitutions that carry through the CFLAGS that were given to the configure script. In addition although LDFLAGS is carried in from the configure script it is not used in any of the link stages in the Makefile.

Minor issue. Makefile.pre.in also does not carry through the 'libdir' configure variable and should be referencing the other pre-defined configure variables.

Solution: See attached patches to Makefile.pre.in

File Added: Makefile.pre.in.patch