-dnl
-dnl Are we running under the GNU libc? Need -D_GNU_SOURCE to get
-dnl caddr_t and such.
-dnl
-AC_DEFUN(FPTOOLS_GNU_LIBC,
-[AC_CACHE_CHECK([GNU libc], fptools_cv_gnu_libc,
-[AC_EGREP_CPP(yes,
-[#include <features.h>
-#ifdef __GLIBC__
-yes
-#endif
-], fptools_cv_gnu_libc=yes, fptools_cv_gnu_libc=no)])
-if test "$fptools_cv_gnu_libc" = yes; then
- AC_DEFINE(_GNU_SOURCE)
-fi
-])
-