+AC_CANONICAL_HOST
+PKG_CHECK_MODULES([UBLIO], [libublio], [
+ CFLAGS="$CFLAGS $UBLIO_CFLAGS"
+ LIBS="$LIBS $UBLIO_LIBS"
+ AC_DEFINE([USE_UBLIO], [1],
+ [Define if block devices are not supported.])
+], [:])
+PKG_CHECK_MODULES([FUSE3], [fuse3],
+ [AC_DEFINE([FUSE_USE_VERSION], [30], [Required FUSE API version.])],
+ [PKG_CHECK_MODULES([FUSE2], [fuse >= 2.6],
+ [AC_DEFINE([FUSE_USE_VERSION], [26], [Required FUSE API version.])])])
+case "$host_os" in
+ *-gnu)
+ AC_DEFINE([_XOPEN_SOURCE], [500], [Enable pread() and pwrite().])
+ AC_DEFINE([_DEFAULT_SOURCE], [], [Enable vsyslog().])
+ ;;
+esac