perhaps a better fix
diff --git a/libbb/loop.c b/libbb/loop.c
index bbfe2ac..bd837c3 100644
--- a/libbb/loop.c
+++ b/libbb/loop.c
@@ -19,7 +19,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#if defined (__GLIBC__) && !defined(__UCLIBC__)
 #include <asm/posix_types.h>
+#endif
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>