main/sed: enable test suite again

main/sed/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=sed
 pkgver=4.8
-pkgrel=0
+pkgrel=1
 subpackages="$pkgname-doc"
 pkgdesc="GNU stream editor"
 url="https://www.gnu.org/software/sed"
 arch="all"
 license="GPL-3.0-or-later"
 makedepends="perl"
-checkdepends="diffutils"
+checkdepends="diffutils coreutils"
 install="$pkgname.post-deinstall"
 # GNU's master site seems to be down. use a mirror for now
 #source="https://ftp.gnu.org/pub/gnu/$pkgname/$pkgname-$pkgver.tar.xz
 source="https://ftp.heanet.ie/mirrors/ftp.gnu.org/gnu/sed/sed-$pkgver.tar.xz
 	"
-# testsuite fails because busybox provides a /usr/bin/timeout
-options="!check"
 
 build() {
+	# sed assumes a realpath(3) implementation which strips
+	# repeated path separators ('/'). musl's realpath implementation
+	# does not strip repeated path separators at the beginning of a
+	# path. This causes failures of the sed test suite.
+	#
+	# To workaround this issue, use a sed compat implementation of
+	# realpath(3) by setting gl_cv_func_realpath_works=no.
+	gl_cv_func_realpath_works=no \
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -41,4 +47,6 @@ package() {
 	rmdir -p "$pkgdir"/usr/lib 2>/dev/null || true
 }
 
-sha512sums="7de25d9bc2981c63321c2223f3fbcab61d7b0df4fcf7d4394b72400b91993e1288d8bf53948ed5fffcf5a98c75265726a68ad4fb98e1d571bf768603a108c1c8  sed-4.8.tar.xz"
+sha512sums="
+7de25d9bc2981c63321c2223f3fbcab61d7b0df4fcf7d4394b72400b91993e1288d8bf53948ed5fffcf5a98c75265726a68ad4fb98e1d571bf768603a108c1c8  sed-4.8.tar.xz
+"