Typo in the Makefile.am regarding one of the newly added file.

src/Makefile.am

@@ -50,7 +50,7 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
     chemistry.h chemistry_io.h chemistry_struct.h cosmology.h restart.h space_getsid.h utilities.h \
     mesh_gravity.h cbrt.h exp10.h velociraptor_interface.h swift_velociraptor_part.h outputlist.h \
     logger_io.h tracers_io.h tracers.h tracers_struct.h star_formation_io.h \
-    star_formation_struct.h star_formation.h star_formation_struct.h \
+    star_formation_struct.h star_formation.h star_formation_iact.h \
     velociraptor_struct.h velociraptor_io.h random.h
 
 # source files for EAGLE cooling