Question

$ ocaml -version
The OCaml toplevel, version 4.02.1
$ opam --version
1.2.0
$ opam init 
$ opam install core

#=== ERROR while installing camlp4.4.02.1+system ==============================#
# opam-version 1.2.0
# os           linux
# command      sh ./check-camlp4.sh
# path         /home/john/.opam/system/build/camlp4.4.02.1+system
# compiler     system (4.02.1)
# exit-code    1
# env-file     /home/john/.opam/system/build/camlp4.4.02.1+system/camlp4-32324-f0f09f.env
# stdout-file  /home/john/.opam/system/build/camlp4.4.02.1+system/camlp4-32324-f0f09f.out
# stderr-file  /home/john/.opam/system/build/camlp4.4.02.1+system/camlp4-32324-f0f09f.err
### stdout ###
# ...[truncated]
# 4.02 by switching to a local installation via `opam switch 4.02.1`.
# 
# Here are some installation instructions for camlp4 if you obtained OCaml
# via the OPAM binary packages:
# 
# http://software.opensuse.org/download.html?project=home%3Aocaml&package=ocaml
# 
# * Debian/Ubuntu: sudo apt-get install camlp4-extra
# * RHEL/CentOS/Fedora: sudo yum install ocaml-camlp4
# 
### stderr ###
# ./check-camlp4.sh: line 3: camlp4orf: command not foun

我在opam init期间对自动完成脚本问题回答是。此外，错误的截断部分表明以下内容：

请安装系统范围的camlp4。这是必要的   因为您正在使用OCaml 4.02.1和系统编译器开关（其中   使用您预先存在的安装，而不是从中编译   划痕）。

如果您无法安装系统范围的camlp4，那么您仍然可以使用   OCaml的   4.02通过opam switch 4.02.1
切换到本地安装

# pacman -S camlp4
$ opam install camlp4
$ opam info camlp4
            package: camlp4
            version: 4.02.1+system
         repository: default
           homepage: https://github.com/ocaml/camlp4
            license: LGPLv2
  installed-version: 4.02.1+system [system]

再次......

$ opam install core

#=== ERROR while installing herelib.109.35.02 =================================#
# opam-version 1.2.0
# os           linux
# command      make
# path         /home/john/.opam/system/build/herelib.109.35.02
# compiler     system (4.02.1)
# exit-code    2
# env-file     /home/john/.opam/system/build/herelib.109.35.02/herelib-31366-c61e7b.env
# stdout-file  /home/john/.opam/system/build/herelib.109.35.02/herelib-31366-c61e7b.out
# stderr-file  /home/john/.opam/system/build/herelib.109.35.02/herelib-31366-c61e7b.err
### stdout ###
# ...[truncated]
# ocamlfind ocamlopt -shared -linkall lib/herelib.cmxa -o lib/herelib.cmxs
# ocamlfind ocamldep -syntax camlp4o -package camlp4.extend -package camlp4.quotations -package camlp4.lib -modules lib/pa_here.mli > lib/pa_here.mli.depends
# ocamlfind ocamlc -c -g -syntax camlp4o -package camlp4.extend -package camlp4.quotations -package camlp4.lib -I lib -o lib/pa_here.cmi lib/pa_here.mli
# + ocamlfind ocamlc -c -g -syntax camlp4o -package camlp4.extend -package camlp4.quotations -package camlp4.lib -I lib -o lib/pa_here.cmi lib/pa_here.mli
# File "lib/pa_here.mli", line 1:
# Error: The files /usr/lib/ocaml/pervasives.cmi
#        and /usr/lib/ocaml/camlp4/Camlp4.cmi make inconsistent assumptions
#        over interface Pervasives
# Command exited with code 2.
# Makefile:21: recipe for target 'build' failed
### stderr ###
# File "setup.ml", line 232, characters 8-26:
# Warning 3: deprecated: String.set
# Use Bytes.set instead.
# File "setup.ml", line 2385, characters 6-24:
# Warning 3: deprecated: Lazy.lazy_from_fun
# Use Lazy.from_fun instead.
# E: Failure("Command ''/usr/bin/ocamlbuild' lib/herelib.cma lib/herelib.cmxa lib/herelib.a lib/herelib.cmxs lib/pa_herelib.cma lib/pa_herelib.cmxa lib/pa_here
lib.a lib/pa_herelib.cmxs -use-ocamlfind -tag debug' terminated with error code 10")
# make: *** [build] Error 1

我是否需要切换到其他编译器？

$ opam switch
system  C system  System compiler (4.02.1)
--     -- 3.11.2  Official 3.11.2 release
--     -- 3.12.1  Official 3.12.1 release
--     -- 4.00.0  Official 4.00.0 release
--     -- 4.00.1  Official 4.00.1 release
--     -- 4.01.0  Official 4.01.0 release
--     -- 4.02.0  Official 4.02.0 release
--     -- 4.02.1  Official 4.02.1 release

Answer 1

您应该从系统编译器切换到OPAM的编译器。然后将自动下载和编译编译器的源以及所有先决条件。要切换，请使用以下命令：

opam switch 4.02.1

当然，您可以使用任何可用的编译器代替4.02.1。

实际错误是由于某种原因（我认为由于滚动发布模型），您有不同版本的camlp4和OCaml编译器，因此它们无法相互通信。

如何在（Arch）Linux x86_64上安装OCaml核心库？

1 个答案: