Fix build errors

qpid-proton.spec

@@ -31,9 +31,12 @@ BuildRequires:  openssl-devel
 BuildRequires:  cyrus-sasl-devel
 BuildRequires:  cyrus-sasl-plain
 BuildRequires:  cyrus-sasl-md5
+BuildRequires:  doxygen
+BuildRequires:  jsoncpp-devel
 BuildRequires:  python3-devel
 BuildRequires:  python3-build
 BuildRequires:  python3-cffi
+BuildRequires:  python3-pip
 BuildRequires:  python3-setuptools
 BuildRequires:  python3-sphinx
 BuildRequires:  python3-wheel
@@ -155,7 +158,7 @@ Obsoletes: qpid-proton-cpp-devel-docs
 
 %files cpp-docs
 %license %{proton_licensedir}/LICENSE.txt
-%{proton_datadir}/docs/api-cpp
+%doc %{proton_datadir}/docs/api-cpp
 %doc %{proton_datadir}/examples/cpp/*.cpp
 %doc %{proton_datadir}/examples/cpp/*.hpp
 %doc %{proton_datadir}/examples/cpp/README.dox
@@ -216,6 +219,7 @@ cd BLD
     -DCMAKE_SKIP_RPATH:BOOL=OFF \
    "-DCMAKE_C_FLAGS=$CFLAGS -Wno-deprecated-declarations" \
     -DENABLE_FUZZ_TESTING=NO \
+    -DENABLE_PYTHON_ISOLATED=NO \
     ..
 make all docs %{?_smp_mflags}