I got it. Here is what I see when running install:
ComerMacProRetina:CarpetHDF5 comerduncan$ ls
total 280
-rw-r--r-- 1 comerduncan admin 882 Jun 4 19:49 CarpetHDF5.xml
-rw-r--r-- 1 comerduncan admin 4263 Jun 4 19:49 CarpetHDF5CommonPluginInfo.C
-rw-r--r-- 1 comerduncan admin 3128 Jun 4 19:49 CarpetHDF5EnginePluginInfo.C
-rw-r--r-- 1 comerduncan admin 2800 Jun 4 19:49 CarpetHDF5MDServerPluginInfo.C
-rw-r--r-- 1 comerduncan admin 7006 Jun 4 19:49 CarpetHDF5PluginInfo.C
-rw-r--r-- 1 comerduncan admin 4303 Jun 4 19:49 CarpetHDF5PluginInfo.h
-rw-r--r-- 1 comerduncan admin 483 Jun 4 19:49 H5Index.C
-rw-r--r-- 1 comerduncan admin 149 Jun 4 19:49 H5Index.h
-rw-r--r-- 1 comerduncan admin 3689 Jun 4 19:49 README.TXT
-rw-r--r-- 1 comerduncan admin 52178 Jun 4 19:49 avtCarpetHDF5FileFormat.C
-rw-r--r-- 1 comerduncan admin 33519 Jun 4 19:49 avtCarpetHDF5FileFormat.h
-rwxr-xr-x 1 comerduncan admin 183 Jun 4 19:49 install*
ComerMacProRetina:CarpetHDF5 comerduncan$ ./install
make: *** No rule to make target `clean'. Stop.
rm: Makefile: No such file or directory
rm: CMakeLists.txt: No such file or directory
rm: CMakeCache.txt: No such file or directory
rm: CMakeFiles: No such file or directory
rm: cmake_install.cmake: No such file or directory
./install: line 8: xmledit: command not found
./install: line 9: xml2cmake: command not found
CMake Error: The source directory "/Users/comerduncan/Cactus/arrangements/CarpetHDF5" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
make: *** No targets specified and no makefile found. Stop.
Neither xmledit nor xml2cmake are on my system.
I don't enjoy complaining... so tell me there is a simple way around these issues :).