Attempt to fix:

In file included from /opt/local/var/macports/build/rdkit-d4aff832/work/rdkit-2025_09_6/Code/DataStructs/RealValueVect.cpp:11:
/opt/local/var/macports/build/rdkit-d4aff832/work/rdkit-2025_09_6/Code/DataStructs/RealValueVect.h:96:23: error: implicit instantiation of undefined template 'std::vector<double>'
   96 |   std::vector<double> d_data;
      |                       ^
/opt/local/include/libcxx/v1/iosfwd:216:28: note: template is declared here
  216 | class _LIBCPP_TEMPLATE_VIS vector;
      |                            ^
1 error generated.
--- Code/DataStructs/RealValueVect.h.orig	2026-05-07 12:06:13
+++ Code/DataStructs/RealValueVect.h	2026-05-07 12:06:49
@@ -15,6 +15,7 @@
 #include <boost/smart_ptr.hpp>
 #include <string>
 #include <cstring>
+#include <vector>
 
 namespace RDGeom {
 class UniformRealValueGrid3D;