diff --git a/config/check_spidermonkey_style.py b/config/check_spidermonkey_style.py
index 8a074cc98d0f..d771b589e86f 100644
--- a/config/check_spidermonkey_style.py
+++ b/config/check_spidermonkey_style.py
@@ -71,6 +71,8 @@ included_inclnames_to_ignore = set([
     'prcvar.h',                 # NSPR
     'prerror.h',                # NSPR
     'prinit.h',                 # NSPR
+    'prio.h',                   # NSPR
+    'private/pprio.h',          # NSPR
     'prlink.h',                 # NSPR
     'prlock.h',                 # NSPR
     'prprf.h',                  # NSPR
diff --git a/js/src/jit/shared/IonAssemblerBufferWithConstantPools.h b/js/src/jit/shared/IonAssemblerBufferWithConstantPools.h
index 78f1f30f683c..a876546ba1bd 100644
--- a/js/src/jit/shared/IonAssemblerBufferWithConstantPools.h
+++ b/js/src/jit/shared/IonAssemblerBufferWithConstantPools.h
@@ -726,7 +726,7 @@ struct AssemblerBufferWithConstantPools : public AssemblerBuffer<SliceSize, Inst
     }
 
     static const unsigned OOM_FAIL = unsigned(-1);
-    static const unsigned NO_DATA = unsigned(-2);
+    static const unsigned DUMMY_INDEX = unsigned(-2);
 
     // Check if it is possible to add numInst instructions and numPoolEntries
     // constant pool entries without needing to flush the current pool.
@@ -810,7 +810,7 @@ struct AssemblerBufferWithConstantPools : public AssemblerBuffer<SliceSize, Inst
         // The pool entry index is returned above when allocating an entry, but
         // when not allocating an entry a dummy value is returned - it is not
         // expected to be used by the caller.
-        return NO_DATA;
+        return DUMMY_INDEX;
     }
 
   public:
diff --git a/js/src/jslock.h b/js/src/jslock.h
index 5e3b43eb6f0e..e854cdbae866 100644
--- a/js/src/jslock.h
+++ b/js/src/jslock.h
@@ -17,8 +17,10 @@
 
 # include "prcvar.h"
 # include "prinit.h"
+# include "prio.h"
 # include "prlock.h"
 # include "prthread.h"
+# include "private/pprio.h"
 
 #endif
 
diff --git a/js/src/jspubtd.h b/js/src/jspubtd.h
index ebd7df5b7be5..30594592843a 100644
--- a/js/src/jspubtd.h
+++ b/js/src/jspubtd.h
@@ -436,4 +436,11 @@ struct PerThreadDataFriendFields
 
 } /* namespace js */
 
+MOZ_BEGIN_EXTERN_C
+
+// Defined in NSPR prio.h.
+typedef struct PRFileDesc PRFileDesc;
+
+MOZ_END_EXTERN_C
+
 #endif /* jspubtd_h */
diff --git a/js/src/vm/PosixNSPR.cpp b/js/src/vm/PosixNSPR.cpp
index b2bfe32e382f..7141a1559567 100644
--- a/js/src/vm/PosixNSPR.cpp
+++ b/js/src/vm/PosixNSPR.cpp
@@ -370,4 +370,46 @@ PR_WaitCondVar(PRCondVar* cvar, PRIntervalTime timeout)
     }
 }
 
+int32_t
+PR_FileDesc2NativeHandle(PRFileDesc* fd)
+{
+    MOZ_CRASH("PR_FileDesc2NativeHandle");
+}
+
+PRStatus
+PR_GetOpenFileInfo(PRFileDesc *fd, PRFileInfo *info)
+{
+    MOZ_CRASH("PR_GetOpenFileInfo");
+}
+
+int32_t
+PR_Seek(PRFileDesc *fd, int32_t offset, PRSeekWhence whence)
+{
+    MOZ_CRASH("PR_Seek");
+}
+
+PRFileMap*
+PR_CreateFileMap(PRFileDesc *fd, int64_t size, PRFileMapProtect prot)
+{
+    MOZ_CRASH("PR_CreateFileMap");
+}
+
+void*
+PR_MemMap(PRFileMap *fmap, int64_t offset, uint32_t len)
+{
+    MOZ_CRASH("PR_MemMap");
+}
+
+PRStatus
+PR_MemUnmap(void *addr, uint32_t len)
+{
+    MOZ_CRASH("PR_MemUnmap");
+}
+
+PRStatus
+PR_CloseFileMap(PRFileMap *fmap)
+{
+    MOZ_CRASH("PR_CloseFileMap");
+}
+
 #endif /* JS_POSIX_NSPR */
diff --git a/js/src/vm/PosixNSPR.h b/js/src/vm/PosixNSPR.h
index edfd5fbabb34..da815914965d 100644
--- a/js/src/vm/PosixNSPR.h
+++ b/js/src/vm/PosixNSPR.h
@@ -10,7 +10,8 @@
 #ifdef JS_POSIX_NSPR
 
 #include <pthread.h>
-#include <stdint.h>
+
+#include "jspubtd.h"
 
 namespace nspr {
 class Thread;
@@ -138,6 +139,58 @@ PR_TicksPerSecond();
 PRStatus
 PR_WaitCondVar(PRCondVar* cvar, PRIntervalTime timeout);
 
+int32_t
+PR_FileDesc2NativeHandle(PRFileDesc* fd);
+
+enum PRFileType
+{
+    PR_FILE_FILE = 1,
+    PR_FILE_DIRECTORY = 2,
+    PR_FILE_OTHER = 3
+};
+
+struct PRFileInfo
+{
+    PRFileType type;
+    int32_t size;
+    int64_t creationTime;
+    int64_t modifyTime;
+};
+
+PRStatus
+PR_GetOpenFileInfo(PRFileDesc *fd, PRFileInfo *info);
+
+enum PRSeekWhence
+{
+    PR_SEEK_SET = 0,
+    PR_SEEK_CUR = 1,
+    PR_SEEK_END = 2
+};
+
+int32_t
+PR_Seek(PRFileDesc *fd, int32_t offset, PRSeekWhence whence);
+
+enum PRFileMapProtect
+{
+    PR_PROT_READONLY,
+    PR_PROT_READWRITE,
+    PR_PROT_WRITECOPY
+};
+
+struct PRFileMap;
+
+PRFileMap*
+PR_CreateFileMap(PRFileDesc *fd, int64_t size, PRFileMapProtect prot);
+
+void*
+PR_MemMap(PRFileMap *fmap, int64_t offset, uint32_t len);
+
+PRStatus
+PR_MemUnmap(void *addr, uint32_t len);
+
+PRStatus
+PR_CloseFileMap(PRFileMap *fmap);
+
 #endif /* JS_POSIX_NSPR */
 
 #endif /* vm_PosixNSPR_h */