/usr/include/mjpegtools/mpeg2enc/ontheflyratectlpass1.hh:1:9: error: '_ONTHEFLYRATECTLPASS1_HH' is used as a header guard here, followed by #define of a different macro [-Werror,-Wheader-guard]
#ifndef _ONTHEFLYRATECTLPASS1_HH
        ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/mjpegtools/mpeg2enc/ontheflyratectlpass1.hh:2:9: note: '_ONTHELFYRATECTLPASS1_HH' is defined here; did you mean '_ONTHEFLYRATECTLPASS1_HH'?
#define _ONTHELFYRATECTLPASS1_HH
        ^~~~~~~~~~~~~~~~~~~~~~~~
        _ONTHEFLYRATECTLPASS1_HH
In file included from ../subprojects/gst-plugins-bad/ext/mpeg2enc/gstmpeg2encoder.cc:31:
/usr/include/mjpegtools/mpeg2enc/ontheflyratectlpass2.hh:1:9: error: '_ONTHEFLYRATECTLPASS2_HH' is used as a header guard here, followed by #define of a different macro [-Werror,-Wheader-guard]
#ifndef _ONTHEFLYRATECTLPASS2_HH
        ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/mjpegtools/mpeg2enc/ontheflyratectlpass2.hh:2:9: note: '_ONTHELFYRATECTLPASS2_HH' is defined here; did you mean '_ONTHEFLYRATECTLPASS2_HH'?
#define _ONTHELFYRATECTLPASS2_HH
        ^~~~~~~~~~~~~~~~~~~~~~~~
        _ONTHEFLYRATECTLPASS2_HH

/usr/include/mjpegtools/mpeg2enc/encoderparams.hh:82:1: error: struct 'RateCtl' was previously declared as a class; this is valid, but may result in linker errors under the Microsoft C++ ABI [-Werror,-Wmismatched-tags]
struct RateCtl;
^
/usr/include/mjpegtools/mpeg2enc/ratectl.hh:50:7: note: previous use is here
class RateCtl
      ^
/usr/include/mjpegtools/mpeg2enc/encoderparams.hh:82:1: note: did you mean class here?
struct RateCtl;
^~~~~~
class