diff --git a/requirements/build.txt b/requirements/build.txt
index b050e01..dde224f 100644
--- a/requirements/build.txt
+++ b/requirements/build.txt
@@ -1,3 +1,4 @@
 python
 boost
 numpy
+# libobjcryst (if libdiffpy built with objcryst)
diff --git a/requirements/conda.txt b/requirements/conda.txt
index a2ce8f0..f4e764d 100644
--- a/requirements/conda.txt
+++ b/requirements/conda.txt
@@ -3,4 +3,6 @@ numpy
 libdiffpy
 setuptools
 diffpy.structure
-periodictable
+gsl
+# periodictable
+# pyobjcryst (up to py3.11 for mac)