if(HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "GIT" OR HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "GIT" OR HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "SVN" OR HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "TGZ")
if(HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "GIT" OR HDF4_ALLOW_EXTERNAL_SUPPORT MATCHES "TGZ")