# Adding -isystem breaks build as it conflicts with clang's own headers.
--- a/mesonbuild/dependencies/base.py
+++ b/mesonbuild/dependencies/base.py
@@ -109,8 +109,9 @@
         if self.include_type == 'system':
             converted = []
             for i in self.compile_args:
+                # vanilla os: we don't use -isystem as it breaks clang.
                 if i.startswith('-I') or i.startswith('/I'):
-                    converted += ['-isystem' + i[2:]]
+                    converted += ['-I' + i[2:]]
                 else:
                     converted += [i]
             return converted