Install on Centos 7

A few hints for folks working with Centos 7.

• Centos ships with gnutls compiled without SRP support. The ocamlnet compilation will fail because of that. I recompiled gnutls with SRP, some RPM/SRPM packages are available there: https://github.com/stephane-martin/gnutls-srp-centos7/releases

• It is much easier to get the Ocaml dependencies with opam. But the installation of opam is not so trivial, as the solver dependencies need a C++14 version of GCC. Of course the native GCC under Centos is not C++14. To bootstrap a Ocaml environment, you can use a prepackaged opam RPM from there: https://github.com/stephane-martin/opam-centos7/releases

• After installing the RPM, just do opam init --comp 4.05.0 as a normal user to get Ocaml. Then you can opam install whatyouwant.

• camlcrush deps should be available through opam (camlidl, coccinelle, config-file, camlp4). Install them, also yum-install autoconf, make, gcc, ... NOTE: ocamlnet is packaged in opam, however the packaged version is not compiled with TLS enabled, this is why ocamlnet must be locally compiled with this support and not installed through opam.

• camlcrush needs to find headers and library for camlidl. After you install camlidl with opam, make them available system-wide with:

sudo ln -s /home/xxx/.opam/4.05.0/lib/camlidl/caml /usr/local/include sudo ln -s /home/xxx/.opam/4.05.0/lib/camlidl/libcamlidl.a /usr/local/lib64

• finally the normal build process for camlcrush should succeed.