262, characters 0-70:
BUILDSTDERR: Warning 3: deprecated: [@@noalloc] should be used instead of "noalloc"
BUILDSTDERR: File "NBDKit.ml", line 290, characters 0-65:
BUILDSTDERR: Warning 3: deprecated: [@@noalloc] should be used instead of "noalloc"
ocamlopt.opt  -c example.ml -o example.cmx
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I../.. -I/usr/lib64/ocaml -I../../include -fPIC -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -fasynchronous-unwind-tables -fstack-clash-protection -c ocaml.c  -fPIC -DPIC -o .libs/libnbdkitocaml_la-ocaml.o
BUILDSTDERR: Use of uninitialized value in bitwise and (&) at /usr/share/perl5/vendor_perl/Pod/Man.pm line 802.
BUILDSTDERR: Wide character in print at /builddir/build/BUILD/nbdkit-1.16.0/podwrapper.pl line 463.
/bin/sh ../../libtool  --tag=CC   --mode=link gcc  -fPIC  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -fasynchronous-unwind-tables -fstack-clash-protection  -Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -o libnbdkitocaml.la -rpath /usr/lib64 libnbdkitocaml_la-ocaml.lo   
libtool: link: gcc -shared  -fPIC -DPIC  .libs/libnbdkitocaml_la-ocaml.o   -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -O2 -g -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,-z -Wl,relro -Wl,--as-needed -Wl,-z -Wl,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld   -Wl,-soname -Wl,libnbdkitocaml.so.0 -o .libs/libnbdkitocaml.so.0.0.0
libtool: link: (cd ".libs" && rm -f "libnbdkitocaml.so.0" && ln -s "libnbdkitocaml.so.0.0.0" "libnbdkitocaml.so.0")
libtool: link: (cd ".libs" && rm -f "libnbdkitocaml.so" && ln -s "libnbdkitocaml.so.0.0.0" "libnbdkitocaml.so")
libtool: link: ( cd ".libs" && rm -f "libnbdkitocaml.la" && ln -s "../libnbdkitocaml.la" "libnbdkitocaml.la" )
ocamlopt.opt  \
  -output-obj -runtime-variant _pic -o nbdkit-ocamlexample-plugin.so \
  NBDKit.cmx example.cmx \
  -cclib -L.libs -cclib -lnbdkitocaml
BUILDSTDERR: /usr/bin/ld: example.o(.text+0x58): unresolvable R_RISCV_PCREL_HI20 relocation against symbol `ocaml_nbdkit_parse_size'
BUILDSTDERR: /usr/bin/ld: final link failed: bad value
BUILDSTDERR: collect2: error: ld returned 1 exit status
BUILDSTDERR: File "caml_startup", line 1:
BUILDSTDERR: Error: Error during linking
make[3]: Leaving directory '/builddir/build/BUILD/nbdkit-1.16.0/plugins/ocaml'
BUILDSTDERR: make[3]: *** [Makefile:935: nbdkit-ocamlexample-plugin.so] Error 2
BUILDSTDERR: make[2]: *** [Makefile:504: all-recursive] Error 1
make[2]: Leaving directory '/builddir/build/BUILD/nbdkit-1.16.0/plugins'
make[1]: Leaving directory '/builddir/build/BUILD/nbdkit-1.16.0'
BUILDSTDERR: make[1]: *** [Makefile:693: all-recursive] Error 1
BUILDSTDERR: make: *** [Makefile:559: all] Error 2
RPM build errors:
BUILDSTDERR: error: Bad exit status from /var/tmp/rpm-tmp.PoaaLs (%build)
BUILDSTDERR:     bogus date in %changelog: Fri Oct 24 2019 Richard W.M. Jones <rjones@redhat.com> - 1.15.6-1
BUILDSTDERR:     Bad exit status from /var/tmp/rpm-tmp.PoaaLs (%build)
Child return code was: 1
EXCEPTION: [Error()]
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/mockbuild/trace_decorator.py", line 96, in trace
    result = func(*args, **kw)
  File "/usr/lib/python3.7/site-packages/mockbuild/util.py", line 700, in do
    raise exception.Error("Command failed: \n # %s\n%s" % (command, output), child.returncode)
mockbuild.exception.Error: Command failed: 
 # bash --login -c /usr/bin/rpmbuild -bb --target riscv64 --nodeps /builddir/build/SPECS/nbdkit.spec