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-rw-r--r--pkgs/misc/screensavers/xautolock/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/misc/screensavers/xautolock/default.nix b/pkgs/misc/screensavers/xautolock/default.nix
index c050454790d..c65c7ef121c 100644
--- a/pkgs/misc/screensavers/xautolock/default.nix
+++ b/pkgs/misc/screensavers/xautolock/default.nix
@@ -13,6 +13,7 @@ stdenv.mkDerivation rec {
       sha256 = "042lc5yyyl3zszll2l930apysd0lip26w0d0f0gjkl7sbhshgk8v";
     })
   ];
+  NIX_CFLAGS_COMPILE = "-DSYSV";
   makeFlags="BINDIR=\${out}/bin MANPATH=\${out}/man";
   preBuild = "xmkmf";
   installTargets = "install install.man";