diff --git a/configure.pri b/configure.pri
index 519b1aa657b..6c80a8cd663 100644
--- a/configure.pri
+++ b/configure.pri
@@ -169,16 +169,6 @@ defineTest(qtConfTest_detectNinja) {
     return(false)
 }
 
-defineTest(qtConfTest_detectProtoc) {
-    protoc = $$qtConfFindInPath("protoc")
-    isEmpty(protoc) {
-        qtLog("Optional protoc could not be found.")
-        return(false)
-    }
-    qtLog("Found protoc from path: $$protoc")
-    return(true)
-}
-
 defineTest(qtConfTest_detectGn) {
     gn = $$qtConfFindInPath("gn$$EXE_SUFFIX")
     !isEmpty(gn) {
diff --git a/src/buildtools/configure.json b/src/buildtools/configure.json
index 58f3abb4d42..812a91f9c4a 100644
--- a/src/buildtools/configure.json
+++ b/src/buildtools/configure.json
@@ -108,12 +108,6 @@
                 "-ljpeg"
             ]
         },
-        "webengine-jsoncpp": {
-            "label": "jsoncpp",
-            "sources": [
-                { "type": "pkgConfig", "args": "jsoncpp" }
-            ]
-        },
         "webengine-libevent": {
             "label": "libevent",
             "sources": [
@@ -132,12 +126,6 @@
                 { "type": "pkgConfig", "args": "libpng >= 1.6.0" }
             ]
         },
-        "webengine-protobuf": {
-            "label": "protobuf",
-            "sources": [
-                { "type": "pkgConfig", "args": "protobuf" }
-            ]
-        },
         "webengine-zlib": {
             "label": "zlib",
             "sources": [
@@ -327,10 +315,6 @@
             "type": "detectJumboBuild",
             "log": "merge_limit"
         },
-        "webengine-protoc": {
-            "label": "protoc",
-            "type": "detectProtoc"
-        },
         "webengine-win-compiler64": {
             "label": "64bit compiler",
             "type": "isWindowsHostCompiler64"
@@ -600,16 +584,6 @@
             "condition": "config.unix && libs.webengine-libevent",
             "output": [ "privateFeature" ]
         },
-        "webengine-system-jsoncpp" : {
-            "label": "jsoncpp",
-            "condition": "config.unix && libs.webengine-jsoncpp",
-            "output": [ "privateFeature" ]
-        },
-        "webengine-system-protobuf" : {
-            "label": "protobuf",
-            "condition": "config.unix && libs.webengine-protobuf && tests.webengine-protoc",
-            "output": [ "privateFeature" ]
-        },
         "webengine-system-png" : {
             "label": "png",
             "condition": "config.unix && features.system-png && libs.webengine-png",
@@ -779,7 +753,6 @@
             "section": "Qt WebEngine Build Tools",
             "entries": [
                 "webengine-system-ninja",
-                "webengine-system-gn",
                 {
                     "message": "Jumbo Build Merge Limit",
                     "type": "jumboBuild"
@@ -829,8 +802,6 @@
                         "webengine-system-zlib",
                         "webengine-system-minizip",
                         "webengine-system-libevent",
-                        "webengine-system-jsoncpp",
-                        "webengine-system-protobuf",
                         "webengine-system-libxml2",
                         "webengine-system-lcms2",
                         "webengine-system-png",
diff --git a/src/core/config/linux.pri b/src/core/config/linux.pri
index 26d0dcf7d12..3e490a0d58e 100644
--- a/src/core/config/linux.pri
+++ b/src/core/config/linux.pri
@@ -41,9 +41,4 @@ qtConfig(webengine-embedded-build) {
     qtConfig(webengine-system-ffmpeg):   gn_args += use_system_ffmpeg=true
     qtConfig(webengine-system-re2):      gn_args += use_system_re2=true
     qtConfig(webengine-system-lcms2):    gn_args += use_system_lcms2=true
-
-    # FIXME:
-    #qtConfig(webengine-system-protobuf): gn_args += use_system_protobuf=true
-    #qtConfig(webengine-system-jsoncpp): gn_args += use_system_jsoncpp=true
-    #qtConfig(webengine-system-libsrtp: gn_args += use_system_libsrtp=true
 }