The cpuset_getaffinity() function is checked in sys/cpuset.h to see if BSD CPU affinity APIs are available. This check requires including sys/param.h to work properly, otherwise the test program fails with unrelated errors like: /usr/include/sys/cpuset.h:155:1: error: unknown type name '__BEGIN_DECLS' __BEGIN_DECLS ^ /usr/include/sys/cpuset.h:156:12: error: unknown type name 'cpusetid_t'; did you mean 'cpuset_t'? int cpuset(cpusetid_t *); and so forth. Signed-off-by: Roman Bogorodskiy <bogorodskiy(a)gmail.com&gt; --- meson.build | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/meson.build b/meson.build index e4f36e8574..ad0cd44aca 100644 --- a/meson.build +++ b/meson.build @@ -709,7 +709,7 @@ if (cc.has_header_symbol('net/if_bridgevar.h', 'BRDGSFD', prefix: brd_required_h endif # Check for BSD CPU affinity availability -if cc.has_header_symbol('sys/cpuset.h', 'cpuset_getaffinity') +if cc.has_header_symbol('sys/cpuset.h', 'cpuset_getaffinity', prefix: '#include <sys/param.h>') conf.set('WITH_BSD_CPU_AFFINITY', 1) endif -- 2.33.1