1 files changed, 3 insertions, 1 deletions
diff --git a/pkgs/development/libraries/librsync/default.nix b/pkgs/development/libraries/librsync/default.nix
index c5a7a7202e2c..2e3df7cf9e05 100644
--- a/pkgs/development/libraries/librsync/default.nix
+++ b/pkgs/development/libraries/librsync/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation rec {
   name = "librsync-${version}";
   version = "1.0.0";
-  
+
   src = fetchFromGitHub {
     owner = "librsync";
     repo = "librsync";
@@ -15,6 +15,8 @@ stdenv.mkDerivation rec {
 
   configureFlags = if stdenv.isCygwin then "--enable-static" else "--enable-shared";
 
+  CFLAGS = "-std=gnu89";
+
   crossAttrs = {
     dontStrip = true;
   };