Add hacky workaround for C++ flags problem, see:

https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/M2VM5DNB7HSAJIFDGT4WAIZDA5JPE5KM/

Seems to be either a dune or C++ bug of some sort.

ocaml-mccs-1.1-c++-flags.patch

@@ -0,0 +1,11 @@
+--- ocaml-mccs-1.1-11/src/dune	2019-12-11 16:55:17.000000000 +0000
++++ ocaml-mccs-1.1-11.new/src/dune	2020-04-22 12:56:05.001005113 +0100
+@@ -6,7 +6,7 @@
+  (public_name mccs)
+  (modules :standard \ context_flags)
+  (cxx_flags
+-  :standard
++  -fPIC -O2 -g
+   -I
+   .
+   (:include cxxflags.sexp))

ocaml-mccs.spec

@@ -16,6 +16,10 @@ URL:            https://github.com/AltGr/ocaml-mccs
 # Upstream's use of a '+' instead of a '.' makes this hard to use a macro.
 Source0:        https://github.com/AltGr/ocaml-mccs/archive/%{version}+%{extraver}/%{name}-%{version}-%{extraver}.tar.gz
 
+# Hacky workaround for:
+# https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/M2VM5DNB7HSAJIFDGT4WAIZDA5JPE5KM/
+Patch1:         ocaml-mccs-1.1-c++-flags.patch
+
 BuildRequires:  ocaml
 BuildRequires:  ocaml-dune
 BuildRequires:  gcc, gcc-c++
@@ -43,10 +47,10 @@ The %{name}-devel package contains libraries and signature files for
 developing applications that use %{name}.
 
 %prep
-%autosetup -n %{name}-%{version}-%{extraver}
+%autosetup -n %{name}-%{version}-%{extraver} -p1
 
 %build
-dune build -p mccs %{?_smp_mflags}
+dune build -p mccs
 
 %install
 # This is an opam dependency. Tragically it means we must manually install,