#serial 3dnl From Gordon Matzigkeit.dnl Test for the GNU C Library.dnl FIXME: this should migrate into libit.AC_DEFUN([AM_GLIBC],  [    AC_CACHE_CHECK(whether we are using the GNU C Library,      ac_cv_gnu_library,      [AC_EGREP_CPP([Thanks for using GNU],	[#include <features.h>#ifdef __GNU_LIBRARY__  Thanks for using GNU#endif	],	ac_cv_gnu_library=yes,	ac_cv_gnu_library=no)      ]    )    AC_CACHE_CHECK(for version 2 of the GNU C Library,      ac_cv_glibc,      [AC_EGREP_CPP([Thanks for using GNU too],	[#include <features.h>#ifdef __GLIBC__  Thanks for using GNU too#endif	],	ac_cv_glibc=yes, ac_cv_glibc=no)      ]    )  ])