--- webkitgtk-2.4.11/Source/WebCore/GNUmakefile.am~	2021-04-21 19:49:53.741585860 +0300
+++ webkitgtk-2.4.11/Source/WebCore/GNUmakefile.am	2021-04-21 19:53:39.520664682 +0300
@@ -151,6 +151,7 @@
 $(GENSOURCES_WEBCORE)/XPathGrammar.cpp: $(WebCore)/xml/XPathGrammar.y
 	$(AM_V_GEN)
 	$(AM_V_at)perl $(WebCore)/css/makegrammar.pl --outputDir $(GENSOURCES_WEBCORE) --bison "$(BISON)" --symbolsPrefix xpathyy $<
+	cp $(GENSOURCES_WEBCORE)/XPathGrammar.h $(GENSOURCES_WEBCORE)/XPathGrammar.hpp
 
 # MathML tag and attribute names, and element factory
 DerivedSources/WebCore/MathMLElementFactory.h: DerivedSources/WebCore/MathMLElementFactory.cpp
@@ -265,6 +266,7 @@
 DerivedSources/WebCore/CSSGrammar.cpp: $(WebCore)/css/CSSGrammar.y.in
 	$(AM_V_GEN)
 	$(AM_V_at)perl -I $(WebCore)/bindings/scripts $(WebCore)/css/makegrammar.pl --extraDefines "$(feature_defines)" --outputDir $(GENSOURCES_WEBCORE) --bison "$(BISON)" --symbolsPrefix cssyy $<
+	cp $(GENSOURCES_WEBCORE)/CSSGrammar.h $(GENSOURCES_WEBCORE)/CSSGrammar.hpp
 
 # user agent style sheets
 USER_AGENT_STYLE_SHEETS = \