diff --git a/srcpkgs/openjdk20-bootstrap/patches/FixNullPtrCast.patch b/srcpkgs/openjdk20-bootstrap/patches/FixNullPtrCast.patch
new file mode 100644
index 00000000000..6f051587927
--- /dev/null
+++ b/srcpkgs/openjdk20-bootstrap/patches/FixNullPtrCast.patch
@@ -0,0 +1,36 @@
+Patch taken from Alpine: https://git.alpinelinux.org/aports/tree/community/openjdk17/FixNullPtrCast.patch
+
+same fix for armv7l-musl added
+
+Subject: Fix cast errors with latest GCC
+Upstream: No
+Author: Simon Frankenberger <simon-alpine@fraho.eu>
+
+This patch fixes one remaining casting error reported by GCC 12 for aarch64
+
+--- old/src/hotspot/cpu/aarch64/interpreterRT_aarch64.cpp
++++ new/src/hotspot/cpu/aarch64/interpreterRT_aarch64.cpp
+@@ -267,7 +267,7 @@
+ 
+   virtual void pass_object() {
+     intptr_t* addr = single_slot_addr();
+-    intptr_t value = *addr == 0 ? NULL : (intptr_t)addr;
++    intptr_t value = *addr == 0 ? (intptr_t) 0 : (intptr_t)addr;
+     if (pass_gpr(value) < 0) {
+       pass_stack<>(value);
+     }
+
+--- old/src/hotspot/cpu/arm/interpreterRT_arm.cpp
++++ new/src/hotspot/cpu/arm/interpreterRT_arm.cpp
+@@ -306,8 +306,8 @@
+   virtual void pass_object() {
+     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
+     if(_last_gp < GPR_PARAMS) {
+-      _toGP[_last_gp++] = (*(intptr_t*)from_addr == 0) ? NULL : from_addr;
++      _toGP[_last_gp++] = (*(intptr_t*)from_addr == 0) ? (intptr_t) 0 : (intptr_t)from_addr;
+     } else {
+-      *_to++ = (*(intptr_t*)from_addr == 0) ? NULL : from_addr;
++      *_to++ = (*(intptr_t*)from_addr == 0) ? (intptr_t) 0 : (intptr_t)from_addr;
+     }
+     _from -= Interpreter::stackElementSize;
+   }
diff --git a/srcpkgs/openjdk20-bootstrap/template b/srcpkgs/openjdk20-bootstrap/template
new file mode 100644
index 00000000000..a23849827ce
--- /dev/null
+++ b/srcpkgs/openjdk20-bootstrap/template
@@ -0,0 +1,101 @@
+# Template file for 'openjdk20-bootstrap'
+pkgname=openjdk20-bootstrap
+version=20.0.2+9
+revision=1
+_gtest_ver=1.8.1
+_java_ver="${version%%.*}"
+_jdk_update="${version#*+}"
+_base_version="${version%+*}"
+_jdk_home="usr/lib/jvm/openjdk${_java_ver}"
+archs="x86_64* aarch64*"
+create_wrksrc=yes
+build_wrksrc="jdk${_java_ver}u-jdk-${version/+/-}"
+build_style=gnu-configure
+configure_args="--disable-warnings-as-errors
+ --enable-unlimited-crypto
+ --with-zlib=system
+ --with-libjpeg=system
+ --with-giflib=system
+ --with-libpng=system
+ --with-lcms=system
+ --with-jtreg=no
+ --with-gtest=../googletest-release-${_gtest_ver}
+ --with-debug-level=release
+ --with-native-debug-symbols=internal
+ --with-jobs=${XBPS_ORIG_MAKEJOBS}
+ --with-version-pre=
+ --with-version-build=${_jdk_update}
+ --with-version-opt=void-r${revision}
+ --with-vendor-name=Void
+ --with-vendor-url=https://voidlinux.org/
+ --with-vendor-bug-url=https://github.com/void-linux/void-packages/issues
+ --with-vendor-vm-bug-url=https://github.com/void-linux/void-packages/issues
+ --with-boot-jdk=/usr/lib/jvm/openjdk$(( _java_ver - 1 ))"
+make_build_args="images"
+make_check_target="test-hotspot-gtest"
+hostmakedepends="pkg-config automake autoconf cpio tar unzip zip ca-certificates
+ openssl zlib-devel which make-ca openjdk$(( _java_ver - 1 ))-bootstrap"
+makedepends="libXrender-devel libXtst-devel libXt-devel libXrandr-devel
+ giflib-devel libjpeg-turbo-devel cups-devel freetype-devel alsa-lib-devel
+ fontconfig-devel zlib-devel lcms2-devel"
+short_desc="OpenJDK Java Development Kit (bootstrap version ${_java_ver})"
+maintainer="classabbyamp <void@placeviolette.net>"
+license="GPL-2.0-only WITH Classpath-exception-2.0"
+homepage="http://openjdk.java.net/"
+distfiles="https://github.com/openjdk/jdk${_java_ver}u/archive/jdk-${version}.tar.gz
+ https://github.com/google/googletest/archive/refs/tags/release-${_gtest_ver}.tar.gz"
+checksum="4d6f176075d5f2ce62fd16ebd5cc4c27a3e551ce4d3d3bc0e9946454e52fc88d
+ 9bf1fe5182a604b4135edc1a425ae356c9ad15e9b23f9f12a02e80184c3a249c"
+nocross=yes
+repository=bootstrap
+patch_args="-Np1 --directory=$build_wrksrc"
+
+# Build and check are still parallel, but don't use -jN.
+disable_parallel_build=yes
+disable_parallel_check=yes
+
+case "$XBPS_TARGET_MACHINE" in
+	i686*|arm*) broken="Unsupported architecture" ;;
+esac
+
+post_extract() {
+	chmod +x "$build_wrksrc"/configure
+	if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
+		rm -r "$build_wrksrc"/src/jdk.hotspot.agent
+	fi
+}
+
+do_configure() {
+	CFLAGS=${CFLAGS/-D_FORTIFY_SOURCE=2/}
+	CXXFLAGS=${CXXFLAGS/-D_FORTIFY_SOURCE=2/}
+
+	# force ELFv2 for ppc64 just in case
+	case "$XBPS_TARGET_MACHINE" in
+		ppc64*)
+			CFLAGS+=" -DABI_ELFv2"
+			CXXFLAGS+=" -DABI_ELFv2"
+			;;
+	esac
+
+	configure_args=${configure_args/--with-libtool-sysroot=$XBPS_CROSS_BASE}
+	if [ "$XBPS_CCACHE" ] && [ -z "$CROSS_BUILD" ]; then
+		configure_args+=" --enable-ccache"
+		CC="/usr/bin/cc"
+		CXX="/usr/bin/c++"
+	fi
+	./configure ${configure_args} \
+		--with-extra-cflags="$CFLAGS" \
+		--with-extra-cxxflags="$CXXFLAGS" \
+		--with-extra-ldflags="$LDFLAGS" \
+		READELF="$READELF" AR="$AR" STRIP="$STRIP" NM="$NM" \
+		OBJDUMP="$OBJDUMP" OBJCOPY="$OBJCOPY"
+}
+
+pre_install() {
+	make_install_args="INSTALL_PREFIX=${DESTDIR}/usr/lib"
+}
+
+post_install() {
+	rm -rf "${DESTDIR}"/usr/lib/bin
+	mv "${DESTDIR}"/usr/lib/jvm/openjdk-"${_base_version}" "${DESTDIR}/$_jdk_home"
+}
diff --git a/srcpkgs/openjdk20-bootstrap/update b/srcpkgs/openjdk20-bootstrap/update
new file mode 100644
index 00000000000..825bd945bfc
--- /dev/null
+++ b/srcpkgs/openjdk20-bootstrap/update
@@ -0,0 +1,4 @@
+site="https://github.com/openjdk/jdk20u/tags"
+pattern='jdk-\K20\.[\d.+]+(?=\.)'
+# don't need to update the bootstrap package
+ignore="*"