--- build2-toolchain-0.13.0-orig/build2/libbuild2/script/regex.cxx	2020-06-10 19:25:37.000000000 +1000
+++ build2-toolchain-0.13.0/build2/libbuild2/script/regex.cxx	2020-08-10 14:00:05.698012838 +1000
@@ -5,6 +5,35 @@
 
 #include <libbuild2/script/regex.hxx>
 
+#if defined(_LIBCPP_VERSION)
+template <>
+void
+std::__1::__match_any_but_newline<build2::script::regex::line_char>::__exec(__state& __s) const
+{
+  if (__s.__current_ != __s.__last_)
+  {
+    switch (*__s.__current_)
+    {
+      case '\r':
+      case '\n':
+        __s.__do_ = __state::__reject;
+        __s.__node_ = nullptr;
+        break;
+      default:
+        __s.__do_ = __state::__accept_and_consume;
+        ++__s.__current_;
+        __s.__node_ = this->first();
+        break;
+    }
+  }
+  else
+  {
+    __s.__do_ = __state::__reject;
+    __s.__node_ = nullptr;
+  }
+}
+#endif
+
 using namespace std;
 
 namespace build2