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-rw-r--r--built_in.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/built_in.h b/built_in.h
index a3b7bf8..8dd1824 100644
--- a/built_in.h
+++ b/built_in.h
@@ -178,7 +178,9 @@ typedef uint8_t u8;
# define bug() assert(0)
#endif
-#define PAGE_SIZE (getpagesize())
+#ifndef PAGE_SIZE
+# define PAGE_SIZE (getpagesize())
+#endif
#define PAGE_MASK (~(PAGE_SIZE - 1))
#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)