diff --git a/External/Photospp/cmt/requirements b/External/Photospp/cmt/requirements
new file mode 100644
index 0000000000000000000000000000000000000000..3f24bb1f0d9fe17a7a7ae319145e0d7cb394b931
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+++ b/External/Photospp/cmt/requirements
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+package Photospp
+
+author James Monk
+
+use AtlasExternalArea     AtlasExternalArea-*     External
+use AtlasHepMC            AtlasHepMC-*            External
+use LCG_Configuration
+
+macro Photospp_home "$(LCG_ROOT)/external/MCGenerators_lcgcmt$(LCG_config_version)/photos++"
+macro Photospp_version "3.52"
+macro Photospp_native_version "$(Photospp_version)_lcgcmt$(LCG_config_version)"
+macro Photospp_system "$(LCG_ext_system)"
+macro Photospp_dir "$(Photospp_home)/$(Photospp_version)/$(Photospp_system)"
+macro Photospp_lib "$(Photospp_dir)/lib"
+macro Photospp_linkopts "-L$(Photospp_lib) -lPhotosCxxInterface -lPhotosFortran"
+
+include_dirs $(Photospp_dir)/include
+apply_pattern declare_installed_libraries dir=$(Photospp_dir)/lib
+macro Photospp_export_paths "$(Photospp_dir)"