1 files changed, 19 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..95ff687
--- /dev/null
+++ b/main.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <sys/cdefs.h>
+
+int main(int argc, char *argv[]) {
+#ifdef _XOPEN_SOURCE
+    printf("_XOPEN_SOURCE = %luL\n", _XOPEN_SOURCE);
+#endif
+
+#ifdef _POSIX_C_SOURCE
+    printf("_POSIX_C_SOURCE = %luL\n", _POSIX_C_SOURCE);
+#endif
+
+#ifdef __DARWIN_C_LEVEL
+    printf("__DARWIN_C_LEVEL = %luL\n", __DARWIN_C_LEVEL);
+#endif
+
+    return 0;
+}
+