Can not build in Alpine linux

[javieriserte-at-calice]

I'm trying to install in Alpine linux 3.20 but it fails, trying to use fseeko64.

I think that fseeko64 is provided by glibc, but alpine uses Musl instead.

g++ -std=gnu++17 -I"/usr/include/R" -DNDEBUG  -I'/usr/lib/R/library/Rcpp/include' -I'/usr/lib/R/library/systemfonts/include'     -fpic  -O2 -fstack-clash-protection -Wformat -Werror=format-security -D_GLIBCXX_ASSERTIONS=1 -D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS=1 -D_LIBCPP_ENABLE_HARDENED_MODE=1 -fno-plt -D__MUSL__   -c tinyxml2.cpp -o tinyxml2.o
tinyxml2.cpp: In member function 'tinyxml2::XMLError tinyxml2::XMLDocument::LoadFile(FILE*)':
tinyxml2.cpp:110:29: error: 'fseeko64' was not declared in this scope; did you mean 'fseeko'?
  110 |         #define TIXML_FSEEK fseeko64
      |                             ^~~~~~~~
tinyxml2.cpp:2335:5: note: in expansion of macro 'TIXML_FSEEK'
 2335 |     TIXML_FSEEK( fp, 0, SEEK_SET );
      |     ^~~~~~~~~~~
tinyxml2.cpp:111:29: error: 'ftello64' was not declared in this scope; did you mean 'ftello'?
  111 |         #define TIXML_FTELL ftello64
      |                             ^~~~~~~~
tinyxml2.cpp:2345:44: note: in expansion of macro 'TIXML_FTELL'
 2345 |         const long long fileLengthSigned = TIXML_FTELL( fp );
      |                                            ^~~~~~~~~~~
make: *** [/usr/lib/R/etc/Makeconf:204: tinyxml2.o] Error 1
ERROR: compilation failed for package ‘ggiraph’

Changing fseeko64 to fseeko in src/tinyxml2.cpp allows to compile in Alpine.

Maybe this can fix it:

    #if defined(__GLIBC__)  // Use fseeko64 if glibc is present
        #define TIXML_FSEEK fseeko64
        #define TIXML_FTELL ftello64
    #else  // If using musl (like Alpine Linux), fall back to fseeko/ftello
        #define TIXML_FSEEK fseeko
        #define TIXML_FTELL ftello
    #endif
    
    #Chatgpt generated by the way