diff --git a/sci-electronics/verilator/files/verilator-4.034-fix-bison.patch b/sci-electronics/verilator/files/verilator-4.034-fix-bison.patch
new file mode 100644
index 0000000000..56d680a7f2
--- /dev/null
+++ b/sci-electronics/verilator/files/verilator-4.034-fix-bison.patch
@@ -0,0 +1,17 @@
+diff --git a/src/Makefile_obj.in b/src/Makefile_obj.in
+index 911f97e1..63799569 100644
+--- a/src/Makefile_obj.in
++++ b/src/Makefile_obj.in
+@@ -323,6 +323,12 @@ V3ParseBison.h: V3ParseBison.c
+ V3ParseBison.c: verilog.y $(BISONPRE)
+ 	@echo "If you get errors from verilog.y below, try upgrading bison to version 1.875 or newer."
+ 	$(PERL) $(BISONPRE) --yacc ${YACC} -d -v -o V3ParseBison.c $<
++	# Unfortunately bison 3.6.1 have break changes caused compile error.
++	# Workaround issue https://github.com/verilator/verilator/issues/2320
++	# This workaround is safe for the old version of bison.
++	# TODO: code should removed when bison fixed the problem.
++	@sed -ie 's#/\* "/\*.*\*/"  \*/##g' V3ParseBison.c
++	@sed -ie 's#/\* "/\*.*\*/"  \*/##g' V3ParseBison.h
+ 
+ V3Lexer_pregen.yy.cpp:	verilog.l V3ParseBison.h $(HEADERS)
+ 	${LEX} --version
diff --git a/sci-electronics/verilator/verilator-4.034.ebuild b/sci-electronics/verilator/verilator-4.034.ebuild
index 10df06610e..bf099b7dc0 100644
--- a/sci-electronics/verilator/verilator-4.034.ebuild
+++ b/sci-electronics/verilator/verilator-4.034.ebuild
@@ -6,13 +6,16 @@ EAPI="7"
 inherit autotools
 
 DESCRIPTION="The fast free Verilog/SystemVerilog simulator"
-HOMEPAGE="https://www.veripool.org/wiki/verilator"
+HOMEPAGE="
+	https://verilator.org
+	https://github.com/verilator/verilator
+"
 
 if [[ "${PV}" == "9999" ]] ; then
 	inherit git-r3
-	EGIT_REPO_URI="https://git.veripool.org/git/${PN}"
+	EGIT_REPO_URI="https://github.com/${PN}/${PN}.git"
 else
-	SRC_URI="http://www.veripool.org/ftp/${P}.tgz -> ${P}.tar.gz"
+	SRC_URI="https://github.com/${PN}/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
 fi
 
@@ -33,6 +36,11 @@ BDEPEND="
 	sys-devel/flex
 "
 
+PATCHES=(
+	# https://github.com/verilator/verilator/issues/2320
+	"${FILESDIR}"/${PN}-4.034-fix-bison.patch
+)
+
 src_prepare() {
 	default
 	eautoconf --force