🚀 go-pugleaf

I dont have idea why i receive this messages, i didnt compile this project
for a while and last time it compiled without errors:

[C++ Error] _stddef.h(37): E2141 Declaration syntax error
[C++ Error] _stddef.h(133): E2090 Qualifier 'std' is not a class or
namespace name
[C++ Error] _stddef.h(133): E2272 Identifier expected
[C++ Error] _stddef.h(134): E2090 Qualifier 'std' is not a class or
namespace name
[C++ Error] _stddef.h(134): E2272 Identifier expected
[C++ Error] _stddef.h(135): E2090 Qualifier 'std' is not a class or
namespace name
[C++ Error] _stddef.h(135): E2272 Identifier expected
[C++ Error] _stddef.h(136): E2090 Qualifier 'std' is not a class or
namespace name
[C++ Error] _stddef.h(136): E2272 Identifier expected
[C++ Error] mem.h(39): E2188 Expression syntax
[C++ Error] mem.h(39): E2293 ) expected
[C++ Error] mem.h(40): E2188 Expression syntax
[C++ Error] mem.h(40): E2293 ) expected
[C++ Error] mem.h(41): E2188 Expression syntax
[C++ Error] mem.h(41): E2293 ) expected
[C++ Error] mem.h(42): E2188 Expression syntax
[C++ Error] mem.h(42): E2293 ) expected
[C++ Error] mem.h(49): E2316 'size_t' is not a member of 'std'
[C++ Error] mem.h(48): E2188 Expression syntax
[C++ Error] mem.h(49): E2293 ) expected
[C++ Error] mem.h(51): E2316 'size_t' is not a member of 'std'
[C++ Error] mem.h(50): E2188 Expression syntax
[C++ Error] mem.h(51): E2293 ) expected
[C++ Error] mem.h(53): E2316 'size_t' is not a member of 'std'
[C++ Error] mem.h(52): E2188 Expression syntax
[C++ Error] mem.h(52): E2228 Too many error or warning messages

i've installed cbuilderx since that but i dont think it would cause any
problems.
Some other projects, which i tried, compiled ok.
I have BCB5.