Topkg_installPackage install.
val nothing : tval to_build : 
  ?header:string ->
  Topkg_conf.t ->
  Topkg_conf.os ->
  t list ->
  Topkg_fpath.t list * Topkg_opam.Install.t * Topkg_test.t list optiontype field =
  ?force:bool ->
  ?built:bool ->
  ?cond:bool ->
  ?exts:Topkg_fexts.t ->
  ?dst:string ->
  string ->
  tval bin : ?auto:bool -> fieldval doc : fieldval etc : fieldval lib : fieldval lib_root : fieldval libexec : ?auto:bool -> fieldval libexec_root : ?auto:bool -> fieldval man : fieldval misc : fieldval sbin : ?auto:bool -> fieldval stublibs : fieldval toplevel : fieldval unknown : string -> fieldval test : 
  ?run:bool ->
  ?dir:Topkg_fpath.t ->
  ?args:Topkg_cmd.t ->
  ?auto:bool ->
  fieldval mllib : 
  ?field:field ->
  ?cond:bool ->
  ?cma:bool ->
  ?cmxa:bool ->
  ?cmxs:bool ->
  ?api:string list ->
  ?dst_dir:Topkg_fpath.t ->
  Topkg_fpath.t ->
  tval clib : 
  ?dllfield:field ->
  ?libfield:field ->
  ?cond:bool ->
  ?lib_dst_dir:Topkg_fpath.t ->
  Topkg_fpath.t ->
  tval codec : t Topkg_codec.t