Missing #includes in Macaroons

[dmacks]

Building xrootd-4.12.6 on OS X 10.13 with all the libs that support macaroons available:

-- Macaroons support: yes
[...]
[ 80%] Building CXX object src/CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsHandler.cc.o
cd /sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/build/src && /sw/var/lib/fink/path-prefix-clang/c++ -DHAVE_ATOMICS -DHAVE_CRYPT -DHAVE_CURL_MULTI_WAIT -DHAVE_DH_PADDED -DHAVE_FSTATAT -DHAVE_GETIFADDRS -DHAVE_LIBZ -DHAVE_NAMEINFO -DHAVE_READLINE -DHAVE_SSL -DHAVE_STRLCPY -DHAVE_TLS -DHAVE_TLS1 -DHAVE_TLS11 -DHAVE_TLS12 -DHAVE_XML2 -DHAVE_XRDCRYPTO -DLT_MODULE_EXT=\".dylib\" -DUSE_LIBC_SEMAPHORE=1 -DXRDPLUGIN_SOVERSION=\"4\" -DXrdMacaroons_4_EXPORTS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -D__macos__=1 -I/sw/include -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/.. -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/. -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/build/src -I/usr/local/include -I/sw/include/json-c -MD -std=c++0x -DOPENSSL_NO_FILENAMES -Wno-deprecated-declarations -O2 -g -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -mmacosx-version-min=10.13 -fPIC -MD -MT src/CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsHandler.cc.o -MF CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsHandler.cc.o.d -o CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsHandler.cc.o -c /sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/XrdMacaroons/XrdMacaroonsHandler.cc
/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/XrdMacaroons/XrdMacaroonsHandler.cc:120:23: error: implicit instantiation of undefined template 'std::__1::basic_stringstream<char, std::__1::char_traits<char>, std::__1::allocator<char> >'
    std::stringstream ss;
                      ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/iosfwd:126:32: note: template is declared here
    class _LIBCPP_TEMPLATE_VIS basic_stringstream;
                               ^

and several more of that same error in other lines. It's cured by adding #include <sstream>, which gets me further until:

cd /sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/build/src && /sw/var/lib/fink/path-prefix-clang/c++ -DHAVE_ATOMICS -DHAVE_CRYPT -DHAVE_CURL_MULTI_WAIT -DHAVE_DH_PADDED -DHAVE_FSTATAT -DHAVE_GETIFADDRS -DHAVE_LIBZ -DHAVE_NAMEINFO -DHAVE_READLINE -DHAVE_SSL -DHAVE_STRLCPY -DHAVE_TLS -DHAVE_TLS1 -DHAVE_TLS11 -DHAVE_TLS12 -DHAVE_XML2 -DHAVE_XRDCRYPTO -DLT_MODULE_EXT=\".dylib\" -DUSE_LIBC_SEMAPHORE=1 -DXRDPLUGIN_SOVERSION=\"4\" -DXrdMacaroons_4_EXPORTS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -D__macos__=1 -I/sw/include -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/.. -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/. -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src -I/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/build/src -I/usr/local/include -I/sw/include/json-c -MD -std=c++0x -DOPENSSL_NO_FILENAMES -Wno-deprecated-declarations -O2 -g -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -mmacosx-version-min=10.13 -fPIC -MD -MT src/CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsConfigure.cc.o -MF CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsConfigure.cc.o.d -o CMakeFiles/XrdMacaroons-4.dir/XrdMacaroons/XrdMacaroonsConfigure.cc.o -c /sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/XrdMacaroons/XrdMacaroonsConfigure.cc
/sw/build.build/xrootd4-4.12.6-1/xrootd-4.12.6/src/XrdMacaroons/XrdMacaroonsConfigure.cc:47:32: error: use of undeclared identifier 'errno'
    return log->Emsg("Config", errno, "open config file", config);
                               ^

and again several more such. #include <errno.h> cures it.

I know xrootd4 is headed for EOL, but this same code (and lack of those includes) appear in the latest file in git.