fix undefined symbols errors when building on linux with clang and op…

…ensubdiv:shared=True and compiler.libcxx == "libc++"

recipes/opensubdiv/all/conanfile.py

@@ -81,6 +81,8 @@ def _configure_cmake(self):
         cmake.definitions["NO_REGRESSION"] = True
         cmake.definitions["NO_TESTS"] = True
         cmake.definitions["NO_GLTESTS"] = True
+        if self.settings.os == "Linux" and self.settings.compiler == "clang" and self.settings.shared and self.settings.compiler.libcxx == "libc++":
+            cmake.definitions["CMAKE_CXX_FLAGS"] = "-stdlib=libc++"
 
         cmake.configure(source_folder=self._source_subfolder, build_folder=self._build_subfolder)