--- btrfs-progs-0.19/btrfsck.c	
+++ btrfs-progs-0.19/btrfsck.c	
@@ -21,6 +21,9 @@ 
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #include "kerncompat.h"
 #include "ctree.h"
 #include "disk-io.h"
--- btrfs-progs-0.19/mkfs.c	
+++ btrfs-progs-0.19/mkfs.c	
@@ -341,7 +341,7 @@ int main(int ac, char **av)
 	u64 alloc_start = 0;
 	u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 	u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
-	u32 leafsize = getpagesize();
+	u32 leafsize = sysconf(_SC_PAGESIZE);
 	u32 sectorsize = 4096;
 	u32 nodesize = leafsize;
 	u32 stripesize = 4096;
@@ -398,7 +398,7 @@ int main(int ac, char **av)
 				print_usage();
 		}
 	}
-	sectorsize = max(sectorsize, (u32)getpagesize());
+	sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));
 	if (leafsize < sectorsize || (leafsize & (sectorsize - 1))) {
 		fprintf(stderr, "Illegal leafsize %u\n", leafsize);
 		exit(1);