New file, contains test for recent Linux 2.1.100+ headers.

sysdeps/unix/sysv/linux/alpha/configure.in

@@ -0,0 +1,36 @@
+sinclude(./aclocal.m4)dnl Autoconf lossage
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/unix/sysv/linux/alpha.
+
+# Don't bother trying to generate any glue code to be compatible with the
+# existing system library, because we are the only system library.
+inhibit_glue=yes
+
+define([LIBC_LINUX_VERSION],[2.1.100])dnl
+if test -n "$sysheaders"; then
+  OLD_CFLAGS=$CFLAGS
+  CFLAGS="$CFLAGS $SYSINCLUDES"
+fi
+define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
+AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
+AC_TRY_COMPILE([#include <linux/version.h>],
+[#if LINUX_VERSION_CODE < ]dnl
+patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
+[ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
+eat flaming death
+#endif],
+	       libc_cv_linuxVER='LIBC_LINUX_VERSION or later',
+	       libc_cv_linuxVER='TOO OLD!')])
+if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
+  AC_MSG_ERROR([GNU libc requires kernel header files from
+Linux LIBC_LINUX_VERSION or later to be installed before configuring.
+The kernel header files are found usually in /usr/include/asm and
+/usr/include/linux; make sure these directories use files from
+Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so
+make sure that file was built correctly when installing the kernel header
+files.  To use kernel headers not from /usr/include/linux, use the
+configure option --with-headers.])
+fi
+if test -n "$sysheaders"; then
+  CFLAGS=$OLD_CFLAGS
+fi