make sure __NF_sysfs exists before trying to use it
diff --git a/libbb/syscalls.c b/libbb/syscalls.c
index dac90e2..6786b1e 100644
--- a/libbb/syscalls.c
+++ b/libbb/syscalls.c
@@ -31,7 +31,16 @@
int sysfs(int option, unsigned int fs_index, char * buf)
{
+#ifndef __NR_pivot_root
+#warning This kernel does not support the sysfs syscall
+#warning -> The sysfs system call is being stubbed out...
+ bb_error_msg("\n\nTo make this application work, you will need to recompile\n"
+ "BusyBox with a kernel supporting the pivot_root system call.\n");
+ errno = ENOSYS;
+ return -1;
+#else
return(syscall(__NR_sysfs, option, fs_index, buf));
+#endif
}
int pivot_root(const char * new_root,const char * put_old)