diff --git a/games-emulation/np2kai/metadata.xml b/games-emulation/np2kai/metadata.xml
index c8c54e1d06..7dcbc88584 100644
--- a/games-emulation/np2kai/metadata.xml
+++ b/games-emulation/np2kai/metadata.xml
@@ -11,12 +11,11 @@
 		It is based on Neko project II.
 	</longdescription>
 	<use>
-		<flag name="sdl">
-			Use <pkg>media-libs/libsdl</pkg> over <pkg>media-libs/libsdl2</pkg>
-		</flag>
+		<flag name="sdl">Use <pkg>media-libs/libsdl</pkg></flag>
+		<flag name="sdl2">Use <pkg>media-libs/libsdl2</pkg></flag>
 		<flag name="i286">
-			Enable i286 emulation.
-			USE="ia32" or USE="haxm" will disable it, 
+			Enable i286 emulation
+			USE="ia32" or USE="haxm" will disable it,
 			unless all 3 emulation USE flags are set
 		</flag>
 		<flag name="ia32">Enable ia32 emulation</flag>
diff --git a/games-emulation/np2kai/np2kai-22.ebuild b/games-emulation/np2kai/np2kai-22.ebuild
index 22a7116ff9..035962b57a 100644
--- a/games-emulation/np2kai/np2kai-22.ebuild
+++ b/games-emulation/np2kai/np2kai-22.ebuild
@@ -3,66 +3,76 @@
 
 EAPI=7
 
-DESCRIPTION="NP2kai is an emulator for the japanese PC-98 series of computers."
+DESCRIPTION="NP2kai is an emulator for the japanese PC-98 series of computers"
 HOMEPAGE="https://domisan.sakura.ne.jp/article/np2kai/np2kai.html"
 SRC_URI="https://github.com/AZO234/NP2kai/archive/refs/tags/rev.${PV}.tar.gz -> ${P}.tar.gz"
 
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="sdl +sdl2 +i286 ia32 haxm"
+REQUIRED_USE="^^ ( sdl sdl2 )"
+
+# Configure crashes if sdl AND sdl2 are not present, even if the options are off
+# It also requires sdl2-ttf even when building for sdl
+# TODO: test musl
+# TODO: migrate from gtk2 to gtk3
+DEPEND="media-libs/libsdl
+	media-libs/libsdl2
+	sdl? (
+		media-libs/sdl-mixer
+		media-libs/sdl-ttf
+	)
+	sdl2? (
+		media-libs/sdl2-mixer
+	)
+	media-libs/sdl2-ttf
+	virtual/libusb:1
+	x11-base/xorg-server
+	x11-libs/gtk+:2"
+RDEPEND="${DEPEND}"
+BDEPEND="sys-devel/automake"
+
+S="${WORKDIR}/NP2kai-rev.${PV}/x11"
+
 PATCHES=(
 	"${FILESDIR}/${P}-autogen.patch"
 )
 
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="~amd64"
-
-IUSE="sdl +i286 ia32 haxm"
-
-# Configure crashes if sdl AND sdl2 are not present, even if the options are off
-# It also requires sdl2-ttf even when building for sdl
-DEPEND="sys-libs/glibc
-	media-libs/libsdl
-	sdl? ( media-libs/sdl-mixer )
-	sdl? ( media-libs/sdl-ttf )
-	media-libs/libsdl2
-	!sdl? ( media-libs/sdl2-mixer )
-	media-libs/sdl2-ttf
-	virtual/libusb:1
-	x11-base/xorg-server
-	x11-libs/gtk+:2"
-
-RDEPEND="${DEPEND}"
-BDEPEND="sys-devel/gcc
-	sys-devel/automake
-	dev-util/cmake"
-
-S=${WORKDIR}/NP2kai-rev.${PV}/x11
-
+# TODO: add a die statement to autogen
 src_configure() {
 	bash "${S}/autogen.sh"
-	sdlconf=$(usex sdl "--enable-sdl --enable-sdlmixer --enable-sdlttf
-						--disable-sdl2 --disable-sdl2mixer --disable-sdl2ttf" \
-						"--enable-sdl2 --enable-sdl2mixer --enable-sdl2ttf
-						--disable-sdl --disable-sdlmixer --disable-sdlttf" )
-	features=$(	if use i286 && use ia32 && use haxm ; \
-					then echo --enable-build-all ; \
-					else echo $(use_enable ia32) $(use_enable haxm) ; \
-				fi )
-	econf ${sdlconf} ${features}
+	if use i286 && use ia32 && use haxm ; then
+		features=("--enable-build-all")
+	else
+		features=($(use_enable ia32) $(use_enable haxm))
+	fi
+	local myeconfargs=(
+		$(use_enable sdl)
+		$(use_enable sdl sdlmixer)
+		$(use_enable sdl sdlttf)
+		$(use_enable sdl2)
+		$(use_enable sdl2 sdl2mixer)
+		$(use_enable sdl2 sdl2ttf)
+	)
+	econf "${myeconfargs[@]}" "${features}"
 }
 
 pkg_postinst() {
-	if [ "${features}" = "--enable-build-all" ] ; then
-		cfgname="{xnp2kai, xnp21kai}"
-	elif ! use ia32 && ! use haxm ; then
-		cfgname="xnp2kai"
-	else
-		cfgname="xnp21kai"
+	if [[ -z ${REPLACING_VERSIONS} ]] ; then
+		if [ use i286 && use ia32 && use haxm ] ; then
+			cfgname="{xnp2kai, xnp21kai}"
+		elif [ ! use ia32 && ! use haxm ] ; then
+			cfgname="xnp2kai"
+		else
+			cfgname="xnp21kai"
+		fi
+
+		elog  	"Japanese fonts are needed to use the emulator."
+		elog   	"Please run the following command to configure them:"
+		elog	"mkdir -p ~/.config/${cfgname} && ln -s /path/to/font.ttf ~/.config/${cfgname}/default.ttf && rm ~/.config/${cfgname}/font.tmp"
+
+		elog	"Neko project 2 requires a BIOS dump to work."
+		elog	"Please dump the BIOS from your device and put the files under ~/.config/${cfgname}"
 	fi
-
-	elog  	"Japanese fonts are needed to use the emulator."
-	elog   	"Please run the following command to configure them:"
-	elog	"mkdir -p ~/.config/${cfgname} && ln -s /path/to/font.ttf ~/.config/${cfgname}/default.ttf && rm ~/.config/${cfgname}/font.tmp"
-
-	elog	"Neko project 2 requires a BIOS dump to work."
-	elog	"Please dump the BIOS from your device and put the files under ~/.config/${cfgname}"
 }