Interesting error while building gcc pass 1

Linux From Scratch - Version r13.0-systemd
5.3. GCC-15.2.0 - Pass 1

# --enable-maintainer-mode to rebuild ../../libcody/config.h.in, or make 
MAINTAINER=touch
g++  -O2 -pipe -Wp,-D_GLIBCXX_ASSERTIONS -fno-exceptions -fno-rtti 
-include config.h -I../../libcody \
   -MMD -MP -MF buffer.d -c -o buffer.o ../../libcody/buffer.cc
In file included from ../../libcody/internal.hh:5,
                  from ../../libcody/buffer.cc:6:
../../libcody/cody.hh: In member function 'void 
Cody::Detail::MessageBuffer::Space()':
../../libcody/cody.hh:113:24: error: no matching function for call to 
'S2C(const char8_t [2])'
   113 |     Append (Detail::S2C(u8" "));
       |             ~~~~~~~~~~~^~~~~~~
   • there is 1 candidate
     • candidate 1: 'template<unsigned int I> constexpr char 
Cody::Detail::S2C(const char (&)[I])'
       ../../libcody/cody.hh:51:16:
          51 | constexpr char S2C (char const (&s)[I])
             |                ^~~
       • template argument deduction/substitution failed:
         •   mismatched types 'const char' and 'const char8_t'
           ../../libcody/cody.hh:113:24:
             113 |     Append (Detail::S2C(u8" "));
                 |             ~~~~~~~~~~~^~~~~~~
../../libcody/buffer.cc: At global scope:
../../libcody/buffer.cc:33:33: error: no matching function for call to 
'S2C(const char8_t [2])'
    33 | static const char CONTINUE = S2C(u8";");
       |                              ~~~^~~~~~~
   • there is 1 candidate
     • candidate 1: 'template<unsigned int I> constexpr char 
Cody::Detail::S2C(const char (&)[I])'
       ../../libcody/cody.hh:51:16:
          51 | constexpr char S2C (char const (&s)[I])
             |                ^~~
       • template argument deduction/substitution failed:
         •   mismatched types 'const char' and 'const char8_t'
           ../../libcody/buffer.cc:33:33:
              33 | static const char CONTINUE = S2C(u8";");
                 |                              ~~~^~~~~~~
../../libcody/buffer.cc: In member function 'void 
Cody::Detail::MessageBuffer::BeginLine()':
../../libcody/buffer.cc:41:28: error: no matching function for call to 
'S2C(const char8_t [2])'
    41 |       buffer.push_back (S2C(u8" "));
       |                         ~~~^~~~~~~

This is on a system that currently has gcc (GCC) 16.1.1 20260430.
Is this because of trying to build gcc-15 on a system that has gcc-16?

 From the duck:
Libcody is a C++11 library implementing a communication protocol between 
compilers and build systems, used notably for GCC LTO jobserver 
integration with GNU Make.
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Hindi madali ang maging ako

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