Enable SIXEL in xterm

user/libsixel/APKBUILD

+# Contributor: Max Rees <maxcrees@me.com>
+# Maintainer: Max Rees <maxcrees@me.com>
+pkgname=libsixel
+pkgver=1.8.2
+pkgrel=0
+pkgdesc="Encoder/decoder implementation for DEC SIXEL graphics"
+url="https://saitoha.github.io/libsixel/"
+arch="all"
+license="MIT AND (MIT OR Unlicense) AND (Public-Domain OR Custom)"
+depends=""
+makedepends="libjpeg-turbo-dev libpng-dev"
+subpackages="$pkgname-dev $pkgname-doc
+	$pkgname-bash-completion:bashcomp:noarch
+	$pkgname-zsh-completion:zshcomp:noarch"
+source="https://github.com/saitoha/libsixel/releases/download/v$pkgver/$pkgname-$pkgver.tar.gz
+	tests.patch"
+
+build() {
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--localstatedir=/var \
+		--with-libcurl=no \
+		--with-gd=no \
+		--with-gdk-pixbuf2=no \
+		--with-jpeg=yes \
+		--with-png=yes \
+		--enable-tests=yes \
+		--enable-python=no
+	make
+}
+
+check() {
+	# Run the tests individually in order to utilize retcode since
+	# top-level "make test" tees output to log files
+	make -C src unittest
+	# Tee this anyway since it dumps copious SIXEL output to stdout
+	# in some cases...
+	make -C converters test 2>&1 | tee test-converters.log | grep '^\['
+	if ! grep -Fqx '[succeeded]' test-converters.log; then
+		return 1
+	fi
+}
+
+package() {
+	make DESTDIR="$pkgdir" install
+}
+
+bashcomp() {
+	pkgdesc="$pkgdesc (Bash completion)"
+	depends=""
+	install_if="$pkgname=$pkgver-r$pkgrel bash-completion"
+
+	mkdir -p "$subpkgdir/usr/share"
+	mv "$pkgdir/usr/share/bash-completion" "$subpkgdir/usr/share"
+}
+
+zshcomp() {
+	pkgdesc="$pkgdesc (Zsh completion)"
+	depends=""
+	install_if="$pkgname=$pkgver-r$pkgrel zsh"
+
+	mkdir -p "$subpkgdir/usr/share"
+	mv "$pkgdir/usr/share/zsh" "$subpkgdir/usr/share"
+}
+
+sha512sums="f0287b7b7a190f0f964e27fc65aa816a78c09de5e50045a25eb05f9b430c74f779a7d5eb591b3430a82a06621d53719bf115bcdd0b99acc9afe3cb9ab6fde271  libsixel-1.8.2.tar.gz
+3118dd2a43ae56702f1a1354683c1aaee774962fc5375c3dee3ccd2fab1268f344cfe12c662e10d6c39547d23460b0189efcfa9af9c4e2cf8bb942ac31f07971  tests.patch"