Fix tarball nosv

release.nix

@@ -51,7 +51,7 @@ let
     nosv = pkgs.releaseTools.sourceTarball {
       name = "nosv-tarball";
       inherit (pkgs.nosv) src version;
-      preAutoconf = "sed -i 's/AC_MSG_RESULT/_AS_ECHO/ configure.ac'";
+      preAutoconf = "sed -i 's/AC_MSG_RESULT/_AS_ECHO/ configure.ac";
     };
   };
 in
@@ -78,6 +78,6 @@ in
       "--with-asan "
       "--with-ubsan"
     ];
-    # CFLAGS = "-Werror";
+    CFLAGS = "-Werror";
   });
 }