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-rw-r--r--tools/perf/util/mmap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 12671d089748..a35dc57d5995 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -12,6 +12,7 @@
#include <linux/zalloc.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h> // sysconf()
#ifdef HAVE_LIBNUMA_SUPPORT
#include <numaif.h>
#endif