close_range is defined in unistd.h when _GNU_SOURCE is defined. The linux/close_range.h include file only defines the (linux specific) flags constants. Reported-by: Alexandra Hájková <ahajkova@xxxxxxxxxx> Signed-off-by: Mark Wielaard <mark@xxxxxxxxx> --- man2/close_range.2 | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/man2/close_range.2 b/man2/close_range.2 index 380a47365..fd13ba645 100644 --- a/man2/close_range.2 +++ b/man2/close_range.2 @@ -11,7 +11,10 @@ Standard C library .RI ( libc ", " \-lc ) .SH SYNOPSIS .nf -.B #include <linux/close_range.h> +.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" +.B #include <unistd.h> +.P +.BR "#include <linux/close_range.h>" " /* For the flags constants */" .P .BI "int close_range(unsigned int " first ", unsigned int " last , .BI " unsigned int " flags ); -- 2.43.0