we require at least zstd API version 1.4

doc/src/Build_extras.rst

@@ -74,7 +74,8 @@ To build with this package you must have the `zlib compression library
 <https://zlib.net>`_ available on your system to build dump styles with
 a '/gz' suffix.  There are also styles using the
 `Zstandard <https://facebook.github.io/zstd/>`_ library which have a
-'/zstd' suffix.
+'/zstd' suffix.  The zstd library version must be at least 1.4.  Older
+versions use an incompatible API and thus LAMMPS will fail to compile.
 
 .. tabs::
 

src/COMPRESS/zstd_file_writer.h

@@ -25,6 +25,11 @@
 #include <string>
 #include <zstd.h>
 
+#if ZSTD_VERSION_NUMBER < 10400
+#error must have at least zstd version 1.4 to compile with -DLAMMPS_ZSTD
+#endif
+
+
 namespace LAMMPS_NS {
 
 class ZstdFileWriter : public FileWriter {