diff --git a/pkgs/tools/misc/ttyrec/default.nix b/pkgs/tools/misc/ttyrec/default.nix
index a836a2a0d0e9..238d2d73d3bb 100644
--- a/pkgs/tools/misc/ttyrec/default.nix
+++ b/pkgs/tools/misc/ttyrec/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl }:
+{ stdenv, fetchurl, buildPlatform }:
 
 stdenv.mkDerivation rec {
   name = "ttyrec-${version}";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   patches = [ ./clang-fixes.patch ];
 
-  makeFlags = [ "CFLAGS=-DSVR4" ]
+  makeFlags = stdenv.lib.optional buildPlatform.isLinux "CFLAGS=-DSVR4"
     ++ stdenv.lib.optional stdenv.cc.isClang "CC=clang";
 
   installPhase = ''