GCC >8.1 required?

[GWRon]

[  8%] Compiling:serialization_utils.cpp
In file included from /home/ronny/Arbeit/Tools/BlitzMaxNG/mod/audio.mod/libopenmpt.mod/openmpt/src/openmpt/all/BuildSettings.hpp:9:0,
                 from /home/ronny/Arbeit/Tools/BlitzMaxNG/mod/audio.mod/libopenmpt.mod/openmpt/common/stdafx.h:16,
                 from /home/ronny/Arbeit/Tools/BlitzMaxNG/mod/audio.mod/libopenmpt.mod/openmpt/common/Profiler.cpp:11:
/home/ronny/Arbeit/Tools/BlitzMaxNG/mod/audio.mod/libopenmpt.mod/openmpt/src/mpt/base/detect_compiler.hpp:47:2: error: #error "GCC version 8.1 required"
 #error "GCC version 8.1 required"
...

Running Mint 19.3 I have only GCC 7.5:

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.5.0-3ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)

As the latest changes try to keep things "pre-C99"-compatible I think it would also require a certain "GCC-version" being still supported.
Maybe the issue is something else (not the GCC-version).

The Requirement was added in 44a40f4 - but because it missed some files it also needs ee74ffc to process compiling (missing a file before)

Think it only affects libopenmpt, the other audio stuff works fine (cleaned modules before, and normal audio stuff required for playback still compiles fine).