Seek and Tell do the right thing in wxIn/OutputStream now Check for GNU extension in configure.in: this is needed for GLIBC 2.1/GCC 2.95 -> this enables _GNU_SOURCE git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3293 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775