No error message is displayed, The following message is displayed for many hours... building '_ctypes' extension x86_64-gentoo-freebsd10.0-gcc -fPIC -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv -I/usr/lib/libffi-3.0.13/include -IInclude -I. -I/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Include -I/var/tmp/portage/dev-lang/python-3.3.3/work/x86_64-gentoo-freebsd10.0 -c /var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/_ctypes.c -o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/_ctypes.o x86_64-gentoo-freebsd10.0-gcc -fPIC -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv -I/usr/lib/libffi-3.0.13/include -IInclude -I. -I/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Include -I/var/tmp/portage/dev-lang/python-3.3.3/work/x86_64-gentoo-freebsd10.0 -c /var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callbacks.c -o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callbacks.o x86_64-gentoo-freebsd10.0-gcc -fPIC -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv -I/usr/lib/libffi-3.0.13/include -IInclude -I. -I/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Include -I/var/tmp/portage/dev-lang/python-3.3.3/work/x86_64-gentoo-freebsd10.0 -c /var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callproc.c -o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callproc.o x86_64-gentoo-freebsd10.0-gcc -fPIC -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv -I/usr/lib/libffi-3.0.13/include -IInclude -I. -I/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Include -I/var/tmp/portage/dev-lang/python-3.3.3/work/x86_64-gentoo-freebsd10.0 -c /var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/stgdict.c -o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/stgdict.o x86_64-gentoo-freebsd10.0-gcc -fPIC -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv -I/usr/lib/libffi-3.0.13/include -IInclude -I. -I/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Include -I/var/tmp/portage/dev-lang/python-3.3.3/work/x86_64-gentoo-freebsd10.0 -c /var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/cfield.c -o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/cfield.o x86_64-gentoo-freebsd10.0-gcc -shared -L. -Wno-unused-result -DNDEBUG -O2 -pipe -ggdb -fwrapv build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/_ctypes.o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callbacks.o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/callproc.o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/stgdict.o build/temp.freebsd-10.0_rc2-Gentoo-amd64-3.3/var/tmp/portage/dev-lang/python-3.3.3/work/Python-3.3.3/Modules/_ctypes/cfield.o -L. -L/usr/local/lib -lffi -lpython3.3 -o build/lib.freebsd-10.0_rc2-Gentoo-amd64-3.3/_ctypes.so
I've added to package.use.force the following content. Compile was successful.... profiles/default/bsd/fbsd/amd64/10.0/package.use.force =dev-lang/python-3.2* threads =dev-lang/python-3.3* threads
Recently, dev-lang/python with threads has been used in all environment. You can find the setting in profiles/base/package.use.force closing.