Thanks for the answer. As suggested, I have tried to compile Sage 6.7 and 6.8 from source in Mac OS X 10.11 (El Capitan) public betas 1, 2 and 3, without success.
This is the final message of the process of compilation with sage 6.8 with Mac OS X 10.11 public beta 3: ------------------------------------------------------------------------ Unhandled SIGSEGV: A segmentation fault occurred in Sage. This probably occurred because a *compiled* component of Sage has a bug in it and is not properly wrapped with sig_on(), sig_off(). Sage will now terminate. ------------------------------------------------------------------------ ./sage: line 134: 97511 Segmentation fault: 11 "$SAGE_ROOT/src/bin/sage" "$@" make[2]: *** [doc-html] Error 139 make[1]: *** [all] Error 2 real 1232m33.049s user 542m41.316s sys 61m2.591s *************************************************************** Error building Sage. The following package(s) may have failed to build (not necessarily during this run of 'make all'): The build directory may contain configuration files and other potentially helpful information. WARNING: if you now run 'make' again, the build directory will, by default, be deleted. Set the environment variable SAGE_KEEP_BUILT_SPKGS to 'yes' to prevent this. make: *** [all] Error 1 -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
