diff --git a/0001-build-check-for-renameat2-copy_file_range-with-_GNU_.patch b/0001-build-check-for-renameat2-copy_file_range-with-_GNU_.patch
new file mode 100644
index 0000000..2db3785
--- /dev/null
+++ b/0001-build-check-for-renameat2-copy_file_range-with-_GNU_.patch
@@ -0,0 +1,35 @@
+From fe440cf5f4c9a177e025dda870ace8f093f6632b Mon Sep 17 00:00:00 2001
+From: Igor Gnatenko <i.gnatenko.brain@gmail.com>
+Date: Mon, 9 Jul 2018 12:34:14 +0200
+Subject: [PATCH] build: check for renameat2()/copy_file_range() with
+ _GNU_SOURCE
+
+The config.h which we generate doesn't apply for checks and those
+functions are available only when _GNU_SOURCE is defined.
+
+Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1599252
+Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>
+---
+ meson.build | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/meson.build b/meson.build
+index f42ed16..9dd3ba0 100644
+--- a/meson.build
++++ b/meson.build
+@@ -74,8 +74,10 @@ conf.set('SIZEOF_UID_T', cc.sizeof('uid_t', prefix : '#include <sys/types.h>'))
+ conf.set('SIZEOF_GID_T', cc.sizeof('gid_t', prefix : '#include <sys/types.h>'))
+ 
+ foreach ident : [
+-        ['renameat2',         '''#include <stdio.h>'''],
+-        ['copy_file_range',   '''#include <sys/syscall.h>
++        ['renameat2',         '''#define _GNU_SOURCE
++                                 #include <stdio.h>'''],
++        ['copy_file_range',   '''#define _GNU_SOURCE
++                                 #include <sys/syscall.h>
+                                  #include <unistd.h>'''],
+ ]
+         have = cc.has_function(ident[0], prefix : ident[1])
+-- 
+2.18.0.rc2
+
diff --git a/casync.spec b/casync.spec
index 8b65171..dda152b 100644
--- a/casync.spec
+++ b/casync.spec
@@ -3,7 +3,7 @@
 
 Name:           casync
 Version:        2
-Release:        6%{?gitcommit:.git%{gitcommitshort}}%{?dist}
+Release:        7%{?gitcommit:.git%{gitcommitshort}}%{?dist}
 Summary:        Content Addressable Data Synchronizer
 
 License:        LGPLv2+
@@ -15,6 +15,7 @@ Source0:        https://github.com/systemd/casync/archive/v%{version}/%{name}-%{
 %endif
 Patch0001:      0001-Fix-segv-in-ca_remote_forget_chunk.patch
 Patch0002:      0001-Fix-seed-chunker-discriminator-not-set-78.patch
+Patch0003:      0001-build-check-for-renameat2-copy_file_range-with-_GNU_.patch
 
 BuildRequires:  meson
 BuildRequires:  gcc
@@ -74,6 +75,9 @@ export LC_CTYPE=C.utf8
 %_udevrulesdir/75-casync.rules
 
 %changelog
+* Mon Jul 09 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2-7
+- Fix FTBFS by running proper checks
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild