nixpkgs/pkgs/development/tools/build-managers/meson/boost-Do-not-add-system-paths-on-nix.patch

diff -Naur meson-0.60.2-old/mesonbuild/dependencies/boost.py meson-0.60.2-new/mesonbuild/dependencies/boost.py
--- meson-0.60.2-old/mesonbuild/dependencies/boost.py	2021-11-02 16:58:07.000000000 -0300
+++ meson-0.60.2-new/mesonbuild/dependencies/boost.py	2021-12-12 19:21:27.895705897 -0300
@@ -682,16 +682,7 @@
         else:
             tmp = []  # type: T.List[Path]
 
-            # Add some default system paths
-            tmp += [Path('/opt/local')]
-            tmp += [Path('/usr/local/opt/boost')]
-            tmp += [Path('/usr/local')]
-            tmp += [Path('/usr')]
-
-            # Cleanup paths
-            tmp = [x for x in tmp if x.is_dir()]
-            tmp = [x.resolve() for x in tmp]
-            roots += tmp
+            # Remove such spurious, non-explicit "system" paths for Nix&Nixpkgs
 
         self.check_and_set_roots(roots, use_system=True)