It's a glibc specific macro. With the musl libc {,l}stat64 are just a macro defined for compatibility and off_t is always 64bit. The former's expansion causes a build error though: "...testsuite/path.c:191:21: error: redefinition of 'stat'". --- testsuite/path.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/testsuite/path.c b/testsuite/path.c index fa5fceb..74db898 100644 --- a/testsuite/path.c +++ b/testsuite/path.c @@ -187,7 +187,7 @@ WRAP_2ARGS(int, -1, mkdir, mode_t); WRAP_2ARGS(int, -1, access, int); WRAP_2ARGS(int, -1, stat, struct stat*); WRAP_2ARGS(int, -1, lstat, struct stat*); -#ifndef _FILE_OFFSET_BITS +#if defined(__GLIBC__) && !defined(_FILE_OFFSET_BITS) WRAP_2ARGS(int, -1, stat64, struct stat64*); WRAP_2ARGS(int, -1, lstat64, struct stat64*); WRAP_OPEN(64); @@ -198,7 +198,7 @@ WRAP_OPEN(); #ifdef HAVE___XSTAT WRAP_VERSTAT(__x,); WRAP_VERSTAT(__lx,); -#ifndef _FILE_OFFSET_BITS +#if defined(__GLIBC__) && !defined(_FILE_OFFSET_BITS) WRAP_VERSTAT(__x,64); WRAP_VERSTAT(__lx,64); #endif -- 2.21.0