diff -ur qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/BUILD.gn qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/BUILD.gn
--- qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/BUILD.gn	2017-05-18 16:51:44.000000000 +0200
+++ qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/BUILD.gn	2017-06-08 10:52:51.565409865 +0200
@@ -49,6 +49,9 @@
       "-Wno-char-subscripts",
     ]
   }
+  ldflags = [
+    "-lnspr4",
+  ]
 }
 
 config("base_implementation") {
@@ -833,8 +836,6 @@
     "third_party/dmg_fp/g_fmt.cc",
     "third_party/icu/icu_utf.cc",
     "third_party/icu/icu_utf.h",
-    "third_party/nspr/prtime.cc",
-    "third_party/nspr/prtime.h",
     "third_party/superfasthash/superfasthash.c",
     "threading/non_thread_safe.h",
     "threading/non_thread_safe_impl.cc",
diff -ur qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/time/pr_time_unittest.cc qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/time/pr_time_unittest.cc
--- qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/time/pr_time_unittest.cc	2017-05-18 16:51:44.000000000 +0200
+++ qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/time/pr_time_unittest.cc	2017-06-08 10:58:06.743413247 +0200
@@ -7,7 +7,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/third_party/nspr/prtime.h"
+#include <nspr4/prtime.h>
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
diff -ur qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/time/time.cc qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/time/time.cc
--- qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/base/time/time.cc	2017-05-18 16:51:44.000000000 +0200
+++ qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/base/time/time.cc	2017-06-08 10:58:09.557373071 +0200
@@ -14,7 +14,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
-#include "base/third_party/nspr/prtime.h"
+#include <nspr4/prtime.h>
 #include "build/build_config.h"
 
 namespace base {
diff -ur qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/tools/gn/bootstrap/bootstrap.py qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/tools/gn/bootstrap/bootstrap.py
--- qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/tools/gn/bootstrap/bootstrap.py	2017-05-18 16:51:44.000000000 +0200
+++ qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/tools/gn/bootstrap/bootstrap.py	2017-06-08 10:55:05.945934291 +0200
@@ -473,7 +473,6 @@
       'base/third_party/dmg_fp/dtoa_wrapper.cc',
       'base/third_party/dmg_fp/g_fmt.cc',
       'base/third_party/icu/icu_utf.cc',
-      'base/third_party/nspr/prtime.cc',
       'base/threading/non_thread_safe_impl.cc',
       'base/threading/post_task_and_reply_impl.cc',
       'base/threading/sequenced_task_runner_handle.cc',
@@ -575,7 +574,7 @@
     }
 
   if is_linux:
-    libs.extend(['-lrt'])
+    libs.extend(['-lrt', '-lnspr4'])
     ldflags.extend(['-pthread'])
 
     static_libraries['xdg_user_dirs'] = {
diff -ur qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/tools/gn/BUILD.gn qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/tools/gn/BUILD.gn
--- qtwebengine-opensource-src-5.9.0/src/3rdparty/chromium/tools/gn/BUILD.gn	2017-05-18 16:51:44.000000000 +0200
+++ qtwebengine-opensource-src-5.9.0-system-nspr-prtime/src/3rdparty/chromium/tools/gn/BUILD.gn	2017-06-10 21:47:32.622964060 +0200
@@ -274,6 +274,10 @@
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
+
+  libs += [
+    "nspr4",
+  ]
 }
 
 test("gn_unittests") {