diff --git a/src/build/libroot/fs_darwin.cpp b/src/build/libroot/fs_darwin.cpp
index c5e9105d9e..c0bb8c1350 100644
--- a/src/build/libroot/fs_darwin.cpp
+++ b/src/build/libroot/fs_darwin.cpp
@@ -13,19 +13,67 @@
 #include <string.h>
 #include <sys/param.h>
 #include <sys/stat.h>
+#include <sys/time.h>
 #include <unistd.h>
 
 
+int
+eaccess(const char* path, int accessMode)
+{
+	uid_t uid = geteuid();
+	int fileMode = 0;
+
+	struct stat st;
+	if (stat(path, &st) < 0) {
+		// failed to get stat information on path
+		return -1;
+	}
+
+	if (uid == 0) {
+		// user is root
+		// root has always read/write permission, but at least one of the
+		// X bits must be set for execute permission
+		fileMode = R_OK | W_OK;
+		if ((st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)
+			fileMode |= X_OK;
+	} else if (st.st_uid == uid) {
+		// user is node owner
+		if ((st.st_mode & S_IRUSR) != 0)
+			fileMode |= R_OK;
+		if ((st.st_mode & S_IWUSR) != 0)
+			fileMode |= W_OK;
+		if ((st.st_mode & S_IXUSR) != 0)
+			fileMode |= X_OK;
+	} else if (st.st_gid == getegid()) {
+		// user is in owning group
+		if ((st.st_mode & S_IRGRP) != 0)
+			fileMode |= R_OK;
+		if ((st.st_mode & S_IWGRP) != 0)
+			fileMode |= W_OK;
+		if ((st.st_mode & S_IXGRP) != 0)
+			fileMode |= X_OK;
+	} else {
+		// user is one of the others
+		if ((st.st_mode & S_IROTH) != 0)
+			fileMode |= R_OK;
+		if ((st.st_mode & S_IWOTH) != 0)
+			fileMode |= W_OK;
+		if ((st.st_mode & S_IXOTH) != 0)
+			fileMode |= X_OK;
+	}
+
+	if ((accessMode & ~fileMode) != 0) {
+		errno = EACCES;
+		return -1;
+	}
+
+	return 0;
+}
+
+
 int
 faccessat(int fd, const char* path, int accessMode, int flag)
 {
-	if ((flag & AT_EACCESS) == 0) {
-		// Perform access checks using the effective user and group IDs
-		// CURRENTLY UNSUPPORTED
-		errno = ENOTSUP;
-		return -1;
-	}
-
 	if ((flag & AT_SYMLINK_NOFOLLOW) == 0) {
 		// do not dereference, instead return information about the link
 		// itself
@@ -36,7 +84,8 @@ faccessat(int fd, const char* path, int accessMode, int flag)
 
 	if (path && path[0] == '/') {
 		// path is absolute, call access() ignoring fd
-		return access(path, accessMode);
+		return (flag & AT_EACCESS) == 0 ? eaccess(path, accessMode)
+			: access(path, accessMode);
 	}
 
 	if (!fd) {
@@ -47,16 +96,17 @@ faccessat(int fd, const char* path, int accessMode, int flag)
 
 	if (fd == AT_FDCWD) {
 		// fd is set to AT_FDCWD, call access()
-		return access(path, accessMode);
+		return (flag & AT_EACCESS) == 0 ? eaccess(path, accessMode)
+			: access(path, accessMode);
 	}
 
-	struct stat mystat;
-	if (fstat(fd, &mystat) < 0) {
-		// failed to grab stat information, fstat sets errno
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
 		return -1;
 	}
 
-	if ((mystat.st_mode & S_IFDIR) != 0) {
+	if ((dirst.st_mode & S_IFDIR) != 0) {
 		// fd does not point to a directory
 		errno = ENOTDIR;
 		return -1;
@@ -81,55 +131,370 @@ faccessat(int fd, const char* path, int accessMode, int flag)
 		return -1;
 	}
 
-	return access(dirpath, accessMode);
+	return (flag & AT_EACCESS) == 0 ? eaccess(path, accessMode)
+		: access(path, accessMode);
 }
 
 
 int
 fchmodat(int fd, const char* path, mode_t mode, int flag)
 {
-	errno = ENOSYS;
-	return -1;
+	if ((flag & AT_SYMLINK_NOFOLLOW) == 0) {
+		// do not dereference, instead return information about the link
+		// itself
+		// CURRENTLY UNSUPPORTED
+		errno = ENOTSUP;
+		return -1;
+	} else if (flag != 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (path && path[0] == '/') {
+		// path is absolute, call chmod() ignoring fd
+		return chmod(path, mode);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call chmod()
+		return chmod(path, mode);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return chmod(dirpath, mode);
 }
 
 
 int
 fchownat(int fd, const char* path, uid_t owner, gid_t group, int flag)
 {
-	errno = ENOSYS;
-	return -1;
+	if ((flag & AT_SYMLINK_NOFOLLOW) == 0) {
+		// do not dereference, instead return information about the link
+		// itself
+		// CURRENTLY UNSUPPORTED
+		errno = ENOTSUP;
+		return -1;
+	} else if (flag != 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (path && path[0] == '/') {
+		// path is absolute, call chown() ignoring fd
+		return chown(path, owner, group);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call access()
+		return chown(path, owner, group);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return chown(dirpath, owner, group);
 }
 
 
 int
 fstatat(int fd, const char *path, struct stat *st, int flag)
 {
-	errno = ENOSYS;
-	return -1;
+	if ((flag & AT_NO_AUTOMOUNT) == 0) {
+		// Don't automount the terminal ("basename") component of pathname if
+		// it is a directory that is an automount point.
+		// CURRENTLY UNSUPPORTED
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	if ((flag & AT_SYMLINK_NOFOLLOW) == 0) {
+		// do not dereference, instead return information about the link
+		// itself
+		// CURRENTLY UNSUPPORTED
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	if (path && path[0] == '/') {
+		// path is absolute, call stat() ignoring fd
+		return stat(path, st);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call stat()
+		return stat(path, st);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return stat(dirpath, st);
 }
 
 
 int
 mkdirat(int fd, const char *path, mode_t mode)
 {
-	errno = ENOSYS;
-	return -1;
+	if (path && path[0] == '/') {
+		// path is absolute, call mkdir() ignoring fd
+		return mkdir(path, mode);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call mkdir()
+		return mkdir(path, mode);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return mkdir(dirpath, mode);
 }
 
 
 int
 mkfifoat(int fd, const char *path, mode_t mode)
 {
-	errno = ENOSYS;
-	return -1;
+	if (path && path[0] == '/') {
+		// path is absolute, call mkfifo() ignoring fd
+		return mkfifo(path, mode);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call mkfifo()
+		return mkfifo(path, mode);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return mkfifo(dirpath, mode);
 }
 
 
 int
-mknodat(int fd, const char *name, mode_t mode, dev_t dev)
+mknodat(int fd, const char *path, mode_t mode, dev_t dev)
 {
-	errno = ENOSYS;
-	return -1;
+	if (path && path[0] == '/') {
+		// path is absolute, call mknod() ignoring fd
+		return mknod(path, mode, dev);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call mknod()
+		return mknod(path, mode, dev);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return mknod(dirpath, mode, dev);
 }
 
 
@@ -176,6 +541,52 @@ linkat(int toFD, const char *toPath, int linkFD, const char *linkPath, int flag)
 int
 futimesat(int fd, const char *path, const struct timeval times[2])
 {
-	errno = ENOSYS;
-	return -1;
+	if (path && path[0] == '/') {
+		// path is absolute, call utimes() ignoring fd
+		return utimes(path, times);
+	}
+
+	if (!fd) {
+		// fd is not a valid file descriptor
+		errno = EBADF;
+		return -1;
+	}
+
+	if (fd == AT_FDCWD) {
+		// fd is set to AT_FDCWD, call utimes()
+		return utimes(path, times);
+	}
+
+	struct stat dirst;
+	if (fstat(fd, &dirst) < 0) {
+		// failed to grab stat information, fstat() sets errno
+		return -1;
+	}
+
+	if ((dirst.st_mode & S_IFDIR) != 0) {
+		// fd does not point to a directory
+		errno = ENOTDIR;
+		return -1;
+	}
+
+	char *dirpath;
+	dirpath = (char *)malloc(MAXPATHLEN);
+	if (dirpath == NULL) {
+		// ran out of memory allocating dirpath
+		errno = ENOMEM;
+		return -1;
+	}
+
+	if (fcntl(fd, F_GETPATH, dirpath) < 0) {
+		// failed to get the path of fd, fcntl sets errno
+		return -1;
+	}
+
+	if (strlcat(dirpath, path, MAXPATHLEN) > MAXPATHLEN) {
+		// full path is too long, set errno and return
+		errno = ENAMETOOLONG;
+		return -1;
+	}
+
+	return utimes(dirpath, times);
 }
diff --git a/src/build/libroot/fs_darwin.h b/src/build/libroot/fs_darwin.h
index a6c731e0ce..c07fe4041e 100644
--- a/src/build/libroot/fs_darwin.h
+++ b/src/build/libroot/fs_darwin.h
@@ -13,7 +13,9 @@
 #define AT_SYMLINK_FOLLOW	0x02	/* linkat() */
 #define AT_REMOVEDIR		0x04	/* unlinkat() */
 #define AT_EACCESS			0x08	/* faccessat() */
+#define AT_NO_AUTOMOUNT		0x10	/* fstatat */
 
+int eaccess(const char* path, int accessMode);
 int faccessat(int fd, const char* path, int accessMode, int flag);
 int fchmodat(int fd, const char* path, mode_t mode, int flag);
 int fchownat(int fd, const char* path, uid_t owner, gid_t group, int flag);