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dnl *********** GNU libc 2 ***************
AC_DEFUN([AC_GNULIBC],[
  AC_MSG_CHECKING(for GNU libc2)
  AC_CACHE_VAL(knfsd_cv_glibc2,
  [AC_PREPROC_IFELSE([AC_LANG_SOURCE([[
      #include <features.h>
      #if !defined(__GLIBC__)
      # error Nope
      #endif
      ]])],[knfsd_cv_glibc2=yes],[knfsd_cv_glibc2=no])])
  AC_MSG_RESULT($knfsd_cv_glibc2)
  if test $knfsd_cv_glibc2 = yes; then
    CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
    CPPFLAGS_FOR_BUILD="$CPPFLAGS_FOR_BUILD -D_GNU_SOURCE"
  fi
])