diff --git a/nix/build-all.py b/nix/build-all.py
index 30928c4201..8368d7501c 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -1567,13 +1567,7 @@ if "cgal" in targets:
     build_dependency(
         name=cgal_name,
         mode="cmake",
-        build_tool_args=[
-            f"-DGMP_LIBRARIES={Dependencies.get_install_dir('gmp')}/lib/libgmp.{LIBRARY_EXT}",
-            f"-DGMP_INCLUDE_DIR={Dependencies.get_install_dir('gmp')}/include",
-            f"-DMPFR_LIBRARIES={Dependencies.get_install_dir('mpfr')}/lib/libmpfr.{LIBRARY_EXT}",
-            f"-DMPFR_INCLUDE_DIR={Dependencies.get_install_dir('mpfr')}/include",
-            f"-DBoost_INCLUDE_DIR={Dependencies.get_install_dir('boost')}",
-        ],
+        build_tool_args=[],
         download_url="https://github.com/CGAL/cgal.git",
         download_name="cgal",
         download_tool=download_tool_git,
diff --git a/win/build-deps.cmd b/win/build-deps.cmd
index 912edb27ae..28ac20e28d 100644
--- a/win/build-deps.cmd
+++ b/win/build-deps.cmd
@@ -387,8 +387,6 @@ echo BOOST_INSTALL_DIR=%DEPENDENCY_INSTALL_DIR%>>"%~dp0\%BUILD_DEPS_CACHE_PATH%"
 :: TODO: remove it a bit later.
 IF EXIST "%DEPS_DIR%\boost_%BOOST_VERSION:.=_%". rmdir /s /q "%DEPS_DIR%\boost_%BOOST_VERSION:.=_%"
 
-:: Needed for CGAL build.
-set BOOST_ROOT=%DEPENDENCY_DIR%
 :: NOTE Also zip download exists, if encountering problems with 7z for some reason.
 set ZIP_EXT=7z
 set BOOST_ZIP=boost-%BOOST_VERSION%-b2-nodocs.%ZIP_EXT%