some problem about ./comfigure

[freelyyu]

when I run the ./configure,it says configure: error: You must install ocamlbuild as follows:,but I have already installer .
checking for ocamlc... ocamlc
OCaml version is 4.05.0
OCaml library path is /usr/lib/ocaml
checking for ocamlopt... ocamlopt
checking for ocamlc.opt... ocamlc.opt
checking for ocamlopt.opt... ocamlopt.opt
checking for dynlink.cmxa... yes
checking for ocaml... ocaml
checking for ocamldep... ocamldep
checking for ocamlmktop... ocamlmktop
checking for ocamlmklib... ocamlmklib
checking for ocamldoc... ocamldoc
checking for ocamlbuild... no
configure: error: You must install ocamlbuild
yrl@yrl-AHV:/Desktop/obliv-c-obliv-c$ sudo opam install camlp4 ocamlfind ocamlbuild batteries
[WARNING] Running as root is not recommended
[NOTE] Package camlp4 is already installed (current version is 4.06+1).
[NOTE] Package ocamlfind is already installed (current version is 1.8.0).
[NOTE] Package ocamlbuild is already installed (current version is 0.12.0).
[NOTE] Package batteries is already installed (current version is 2.8.0).
yrl@yrl-AHV:/Desktop/obliv-c-obliv-c$

[Newbie-W]

have you solved this problem？i had this problem, too

[shuyanCoding]

RUN eval $(opam env) to update your opam config

[Garyff]

apt install ocamlbuild
then, ./comfigure