error: ‘strcasecmp’ was not declared in this scope; did you mean ‘StrCaseCmp’?

[jiapei100]

I built googletest from source and had it installed on my Ubuntu 24.04 , without any pre-installed gtest packages from default Ubuntu repo.

However, whenever there is `#include <gtest/gtest.h>, I'll obtain the following ERROR messages:

/usr/local/include/gtest/internal/gtest-port.h:2107:10: error: ‘strcasecmp’ was not declared in this scope; did you mean ‘StrCaseCmp’?
 2107 |   return strcasecmp(s1, s2);
      |          ^~~~~~~~~~
      |          StrCaseCmp

And I've already googled a lot, everywhere says

• #include <strings.h>
• -D_GNU_SOURCE for Linux

Anyway, this issue is still there ...

Can anybody give me some suggestions?