diff --git a/usr.sbin/makefs/zfs/dsl.c b/usr.sbin/makefs/zfs/dsl.c
--- a/usr.sbin/makefs/zfs/dsl.c
+++ b/usr.sbin/makefs/zfs/dsl.c
@@ -29,6 +29,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <util.h>
diff --git a/usr.sbin/makefs/zfs/fs.c b/usr.sbin/makefs/zfs/fs.c
--- a/usr.sbin/makefs/zfs/fs.c
+++ b/usr.sbin/makefs/zfs/fs.c
@@ -28,11 +28,12 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/dirent.h>
 #include <sys/stat.h>
 
 #include <assert.h>
+#include <dirent.h>
 #include <fcntl.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -456,7 +457,12 @@
 	fs_populate_time(fs, attrbuf, &sb->st_mtim, ZPL_ATIME, &bonussz);
 	fs_populate_time(fs, attrbuf, &sb->st_ctim, ZPL_CTIME, &bonussz);
 	fs_populate_time(fs, attrbuf, &sb->st_mtim, ZPL_MTIME, &bonussz);
+#ifdef __linux__
+	/* Linux has no st_birthtim; approximate with st_ctim */
+	fs_populate_time(fs, attrbuf, &sb->st_ctim, ZPL_CRTIME, &bonussz);
+#else
 	fs_populate_time(fs, attrbuf, &sb->st_birthtim, ZPL_CRTIME, &bonussz);
+#endif
 
 	fs_populate_varszattr(fs, attrbuf, aces, sizeof(aces), 0,
 	    ZPL_DACL_ACES, &bonussz);
diff --git a/usr.sbin/makefs/zfs/objset.c b/usr.sbin/makefs/zfs/objset.c
--- a/usr.sbin/makefs/zfs/objset.c
+++ b/usr.sbin/makefs/zfs/objset.c
@@ -29,6 +29,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <util.h>
diff --git a/usr.sbin/makefs/zfs/vdev.c b/usr.sbin/makefs/zfs/vdev.c
--- a/usr.sbin/makefs/zfs/vdev.c
+++ b/usr.sbin/makefs/zfs/vdev.c
@@ -30,6 +30,7 @@
 
 #include <assert.h>
 #include <fcntl.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
diff --git a/usr.sbin/makefs/zfs/zap.c b/usr.sbin/makefs/zfs/zap.c
--- a/usr.sbin/makefs/zfs/zap.c
+++ b/usr.sbin/makefs/zfs/zap.c
@@ -33,6 +33,7 @@
 
 #include <assert.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <util.h>
diff --git a/usr.sbin/makefs/zfs/zfs.h b/usr.sbin/makefs/zfs/zfs.h
--- a/usr.sbin/makefs/zfs/zfs.h
+++ b/usr.sbin/makefs/zfs/zfs.h
@@ -32,6 +32,7 @@
 #define	_MAKEFS_ZFS_H_
 
 #include <sys/types.h>
+#include <sys/endian.h>
 #include <sys/queue.h>
 
 #include <bitstring.h>