X-Git-Url: http://git.alex.org.uk

diff --git a/configure.ac b/configure.ac
index f50193f..c78177b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,6 +94,9 @@ AC_CHECK_SIZEOF(unsigned int)
 AC_CHECK_SIZEOF(unsigned long int)
 AC_CHECK_SIZEOF(unsigned long long int)
 AC_CHECK_FUNCS([llseek alarm gethostbyname inet_ntoa memset socket strerror strstr])
+AC_CHECK_FUNC([sync_file_range],
+	[AC_DEFINE([HAVE_SYNC_FILE_RANGE], [sync_file_range(2) is not supported], [sync_file_range(2) is supported])],
+        [])
 AC_FUNC_FORK
 AC_FUNC_SETVBUF_REVERSED
 AC_MSG_CHECKING(whether client should be built)