glibc-2.8_p20080602 installs wrong stdio.h header and vscanf function fails with segfault if source using this header is compiled with -std=c99 option. On 478 line in /usr/include/stdio.h there is a mistake and there is vfscanf where should be vscanf. Reproducible: Always
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/libio/stdio.h.diff?r1=1.78.2.13&r2=1.78.2.14&cvsroot=glibc
fixed in glibc-2.8_p20080602-r1 ... glibc-2.9 already includes the fix http://sources.gentoo.org/gentoo/src/patchsets/glibc/2.8/1050_all_glibc-2.8-stdio-redirect.patch?rev=1.1