AC_CACHE_CHECK(if _DEFAULT_SOURCE can be used as a basis,cf_cv_gnu_library_219,[
cf_save="$CPPFLAGS"
CF_APPEND_TEXT(CPPFLAGS,-D_DEFAULT_SOURCE)
AC_TRY_COMPILE([#include <sys/types.h>],[
#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19) || (__GLIBC__ > 2)
return 0;
AC_CACHE_CHECK(if _DEFAULT_SOURCE can be used as a basis,cf_cv_gnu_library_219,[
cf_save="$CPPFLAGS"
CF_APPEND_TEXT(CPPFLAGS,-D_DEFAULT_SOURCE)
AC_TRY_COMPILE([#include <sys/types.h>],[
#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 19) || (__GLIBC__ > 2)
return 0;