diff -Naur cpulimit-0.2.orig/src/cpulimit.c cpulimit-0.2/src/cpulimit.c
--- cpulimit-0.2.orig/src/cpulimit.c	2015-06-17 08:46:59.000000000 +0200
+++ cpulimit-0.2/src/cpulimit.c	2021-01-23 11:01:12.298033000 +0100
@@ -38,12 +38,14 @@
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/time.h>
+#ifdef __APPLE__
 #include <sys/sysctl.h>
+#endif
 #include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
-#ifdef __APPLE__ || __FREEBSD__
+#if defined(__APPLE__) || defined(__FREEBSD__)
 #include <libgen.h>
 #endif