diff --git a/srcpkgs/qt5-webkit/patches/bison3.7.patch b/srcpkgs/qt5-webkit/patches/bison3.7.patch
new file mode 100644
index 0000000000..b7c3711bcd
--- /dev/null
+++ b/srcpkgs/qt5-webkit/patches/bison3.7.patch
@@ -0,0 +1,18 @@
+--- Source/WebCore/css/makegrammar.pl	2020-04-14 00:51:51.000000000 +0200
++++ Source/WebCore/css/makegrammar.pl	2020-10-25 14:59:39.879927464 +0100
+@@ -73,7 +73,6 @@
+ }
+ 
+ my $fileBase = File::Spec->join($outputDir, $filename);
+-my @bisonCommand = ($bison, "-d", "-p", $symbolsPrefix, $grammarFilePath, "-o", "$fileBase.cpp");
++my @bisonCommand = ($bison, "--no-lines", "--defines=$fileBase.cpp.h", "-p", $symbolsPrefix, $grammarFilePath, "--output=$fileBase.cpp");
+-push @bisonCommand, "--no-lines" if $^O eq "MSWin32"; # Work around bug in bison >= 3.0 on Windows where it puts backslashes into #line directives.
+ system(@bisonCommand) == 0 or die;
+ 
+@@ -91,6 +91,5 @@
+ print HEADER "#endif\n";
+ close HEADER;
+ 
+-unlink("$fileBase.cpp.h");
+ unlink("$fileBase.hpp");
+ 
diff --git a/srcpkgs/qt5-webkit/template b/srcpkgs/qt5-webkit/template
index 742de47c6a..b2e7813cc4 100644
--- a/srcpkgs/qt5-webkit/template
+++ b/srcpkgs/qt5-webkit/template
@@ -14,7 +14,7 @@ configure_args="-DPORT=Qt -DUSE_LD_GOLD=OFF
  -DCMAKE_C_FLAGS_RELEASE=-DNDEBUG
  -DCMAKE_C_FLAGS_DEBUG=-DNDEBUG
  -DCMAKE_C_FLAGS_RELWITHDEBINFO=-DNDEBUG"
-hostmakedepends="flex gperf perl pkg-config python qt5-qmake ruby"
+hostmakedepends="bison gperf perl pkg-config python qt5-qmake ruby"
 makedepends="libwebp-devel libxslt-devel libXcomposite-devel sqlite-devel
  libjpeg-turbo-devel gst-plugins-base1-devel qt5-declarative-devel
  qt5-location-devel qt5-sensors-devel qt5-webchannel-devel hyphen-devel
@@ -27,7 +27,7 @@ distfiles="https://download.qt.io/snapshots/ci/qtwebkit/${_v}/${_snap}/src/submo
 checksum=9a6ed083154c7ec850081102b299afa928ca7e48bbdf2b5f3ae152425e46eb17
 
 CPPFLAGS="-I${XBPS_CROSS_BASE}/usr/include"
-CXXFLAGS="-fpermissive -Wno-class-memaccess"
+CXXFLAGS="-fpermissive -Wno-class-memaccess -Wno-redundant-move -Wno-deprecated-copy"
 
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" qt5-host-tools qt5-declarative-devel ruby-devel"