With just installedpg_shere from current master, and we observe difference in reported version numbers betweenpg_sphere_version() and extension version:

=> select pg_sphere_version(); pg_sphere_version------------------- 1.1.5=> SELECT extversion from pg_catalog.pg_extension where extname = 'pg_sphere'; extversion------------ 1.2.0

Aren't they supposed to be the same?