--- a/testing/mozbase/mozinfo/mozinfo/mozinfo.py	2015-08-06 13:41:02.000000000 -0400
+++ b/testing/mozbase/mozinfo/mozinfo/mozinfo.py	2015-08-21 21:17:00.320766493 -0400
@@ -96,7 +96,7 @@
     import errno
     PR_SET_SECCOMP = 22
     SECCOMP_MODE_FILTER = 2
-    ctypes.CDLL("libc.so.6", use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
+    ctypes.CDLL(ctypes.util.find_library('c'), use_errno=True).prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, 0)
     info['has_sandbox'] = ctypes.get_errno() == errno.EFAULT
 else:
     info['has_sandbox'] = True
--- a/testing/mochitest/runtests.py	2015-08-06 13:41:02.000000000 -0400
+++ b/testing/mochitest/runtests.py	2015-08-21 21:17:36.060766000 -0400
@@ -1097,7 +1097,7 @@
     if not mozinfo.isLinux:
         return False, ''
 
-    libc = ctypes.cdll.LoadLibrary('libc.so.6')
+    libc = ctypes.cdll.LoadLibrary(ctypes.util.find_library('c'))
     O_RDWR = 2
     # These are from linux/videodev2.h