Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [+ CC=clang]: [The default C compiler has been set to clang.]
=============
[+ CXX=clang++]: [The default C++ compiler has been set to clang++]
=============
[ocamlfind mklib -o mlnbd \
  -package unix -I . -I . \
  -ldopt '-Wl,-z,relro -Wl,--as-needed  -Wl,-z,pack-relative-relocs -Wl,-z,now --config=/usr/lib/rpm/redhat/redhat-hardened-clang-ld.cfg  -flto=thin -ffat-lto-objects -Wl,--build-id=sha1  ' \
  libnbdocaml_a-nbd-c.o libnbdocaml_a-buffer.o libnbdocaml_a-handle.o libnbdocaml_a-helpers.o  NBD.cmo \
  -L../lib/.libs -lnbd]: [The ocaml compiler is being used.]
=============
[gcc: error: unrecognized command-line option â--config=/usr/lib/rpm/redhat/redhat-hardened-clang-ld.cfgâ
]: [This is the error that causes the build to fail.]

Issue: The ocaml package has been built with gcc, so it uses gcc as its linker driver.  However, since the default compiler for this RPM build has been set to clang.  gcc is being passed flags that are meant for clang and that it does not support.
Resolution: Rebuild the ocaml package with clang and then rebuild this package.