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Fails to build:

==> Starting build()...
CMake Deprecation Warning at CMakeLists.txt:1 (CMAKE_MINIMUM_REQUIRED):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.
  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.

-- The C compiler identification is GNU 13.2.1
-- The CXX compiler identification is GNU 13.2.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/lib/ccache/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/lib/ccache/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "2.1.0") 
-- Checking for module 'libusb-1.0'
--   Found libusb-1.0, version 1.0.26

[...]

[ 86%] Building CXX object src/CMakeFiles/gchd.dir/gchd/psi_table_header.cpp.o
[ 91%] Building CXX object src/CMakeFiles/gchd.dir/gchd/settings.cpp.o
[ 95%] Building CXX object src/CMakeFiles/gchd.dir/gchd/transcoder.cpp.o
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:584:17: error: ‘uint32_t’ does not name a type
  584 |                 uint32_t maxMacroBlocksPerSecond;
      |                 ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:13:1: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
   12 | #include <iomanip>
  +++ |+#include <cstdint>
   13 | 
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:585:17: error: ‘uint32_t’ does not name a type
  585 |                 uint32_t maxFrameMacroBlocks;
      |                 ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:585:17: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:586:17: error: ‘uint32_t’ does not name a type
  586 |                 uint32_t maxKBitrateProfile; //ordered based on what the profiles mean v_h264_profile 
    (theoretically)
      |                 ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:586:17: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:609:1: error: too many initializers for ‘const 
    h264_level_description_t’
  609 | };
      | ^
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:34: error: ‘uint32_t’ was not declared in 
    this scope
  611 | static float determineH264Level( uint32_t xRes, uint32_t yRes, float frameRate, uint32_t kbitRate )
      |                                  ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:34: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:49: error: ‘uint32_t’ was not declared in 
    this scope
  611 | static float determineH264Level( uint32_t xRes, uint32_t yRes, float frameRate, uint32_t kbitRate )
      |                                                 ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:49: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:64: error: expected primary-expression 
    before ‘float’
  611 | static float determineH264Level( uint32_t xRes, uint32_t yRes, float frameRate, uint32_t kbitRate )
      |                                                                ^~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:81: error: ‘uint32_t’ was not declared in 
    this scope
  611 | static float determineH264Level( uint32_t xRes, uint32_t yRes, float frameRate, uint32_t kbitRate )
      |                                                                                 ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:81: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:611:99: error: expression list treated as 
    compound expression in initializer [-fpermissive]
  611 | static float determineH264Level( uint32_t xRes, uint32_t yRes, float frameRate, uint32_t kbitRate )
      |                                                                                                   ^
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp: In member function ‘void 
    TranscoderSettings::mergeAutodetect(TranscoderSettings&, InputSettings&)’:
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:654:9: error: ‘uint32_t’ was not declared in 
    this scope
  654 |         uint32_t reasonableBitrate=int(31.25 * horizontal); //Seems to be what a lot of settings use.
      |         ^~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:654:9: note: ‘uint32_t’ is defined in header 
    ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:657:48: error: ‘reasonableBitrate’ was not 
    declared in this scope
  657 |         unsigned autoBitrate        = std::min(reasonableBitrate*1.0, highestBitrate );
      |                                                ^~~~~~~~~~~~~~~~~
/var/cache/makepkg/elgato-gchd-git/src/elgato-gchd/src/gchd/settings.cpp:671:46: error: ‘determineH264Level’ cannot be 
    used as a function
  671 |                 h264Level_=determineH264Level( horizontal, vertical, frameRate, getRealMaxBitRateKbps() );
      |                            ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [src/CMakeFiles/gchd.dir/build.make:356: src/CMakeFiles/gchd.dir/gchd/settings.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [CMakeFiles/Makefile2:98: src/CMakeFiles/gchd.dir/all] Error 2
make: *** [Makefile:136: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...
 -> error making: elgato-gchd-git

I can confirm that this works :)