[uclibc-ng-devel] enabling sigsetmask() support

Hi, I'm trying to compile a sourcecode that makes use of sigsetmask() function against uClibc-ng 1.0.6. This symbol is missing from uClibc-ng built with default Buildroot 2015.08 config. Which option should be enabled to have it? I only found two signal options in the config: UCLIBC_HAS_OBSOLETE_BSD_SIGNAL and UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL. The former was enabled by default, the latter was off, but turning it on doesn't help too. I see that sigsetmask() is just a wrapper around sigset_set_old_mask, sigprocmask and sigset_get_old_mask, but I don't want to resort to patching the user app sourcecode if possible. Thanks, Alex