diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 35703c282af..bb8dff83d32 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -101,6 +101,8 @@ stdenv.mkDerivation {
 
   inherit src;
 
+  patchFlags = "";
+
   patches = patches
     ++ optional stdenv.isDarwin ./darwin-no-system-python.patch;
 
diff --git a/pkgs/tools/compression/brotli/default.nix b/pkgs/tools/compression/brotli/default.nix
index 3b4d5519028..7047eeeefa6 100644
--- a/pkgs/tools/compression/brotli/default.nix
+++ b/pkgs/tools/compression/brotli/default.nix
@@ -15,6 +15,8 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
+  cmakeFlags = [];
+
   outputs = [ "out" "dev" "lib" ];
 
   doCheck = true;
diff --git a/pkgs/tools/text/html-tidy/default.nix b/pkgs/tools/text/html-tidy/default.nix
index fcdba6cbba4..1974c0aa4f3 100644
--- a/pkgs/tools/text/html-tidy/default.nix
+++ b/pkgs/tools/text/html-tidy/default.nix
@@ -13,6 +13,8 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake libxslt/*manpage*/ ];
 
+  cmakeFlags = [];
+
   # ATM bin/tidy is statically linked, as upstream provides no other option yet.
   # https://github.com/htacg/tidy-html5/issues/326#issuecomment-160322107