diff --git a/pkgs/development/libraries/qt-6/modules/qtbase.nix b/pkgs/development/libraries/qt-6/modules/qtbase.nix
index e71b0a7613d..72779ac57a5 100644
--- a/pkgs/development/libraries/qt-6/modules/qtbase.nix
+++ b/pkgs/development/libraries/qt-6/modules/qtbase.nix
@@ -5,6 +5,7 @@
 , version
 , coreutils
 , bison
+, buildPackages
 , flex
 , gdb
 , gperf
@@ -224,6 +225,8 @@ stdenv.mkDerivation rec {
   ] ++ lib.optionals stdenv.isDarwin [
     # error: 'path' is unavailable: introduced in macOS 10.15
     "-DQT_FEATURE_cxx17_filesystem=OFF"
+  ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
+    "-DQT_HOST_PATH=${buildPackages.qt6.full}"
   ];
 
   NIX_LDFLAGS = toString (lib.optionals stdenv.isDarwin [
diff --git a/pkgs/development/libraries/qt-6/qtModule.nix b/pkgs/development/libraries/qt-6/qtModule.nix
index 28180d3b0ca..f14c73b10ee 100644
--- a/pkgs/development/libraries/qt-6/qtModule.nix
+++ b/pkgs/development/libraries/qt-6/qtModule.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation (args // {
       if [[ -z "$dontSyncQt" && -f sync.profile ]]; then
         # FIXME: this probably breaks crosscompiling as it's not from nativeBuildInputs
         # I don't know how to get /libexec from nativeBuildInputs to work, it's not under /bin
-        ${lib.getDev self.qtbase}/libexec/syncqt.pl -version "''${version%%-*}"
+        perl ${lib.getDev self.qtbase}/libexec/syncqt.pl -version "''${version%%-*}"
       fi
     '';