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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
])
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