--- /usr/portage/sys-libs/pam/pam-1.3.1-r1.ebuild	2019-05-04 05:39:42.000000000 -0400
+++ /ramfs/pam-1.3.1-r1.ebuild	2019-06-02 19:24:14.703908552 -0400
@@ -40,6 +40,16 @@ S="${WORKDIR}/linux-${P}"
 src_prepare() {
 	default
 	eapply "${FILESDIR}/${PN}-remove-browsers.patch"
+
+	# Bug #687234
+	# Fix build of linux-pam on musl libc due to missing, glibc-specific
+	# functionality.
+	# See: https://patchwork.openembedded.org/patch/109369/
+	if use elibc_musl; then
+		eapply "${FILESDIR}/${P}-musl-add-add-strdupa.patch"
+		eapply "${FILESDIR}/${P}-include-paths-header.patch"
+	fi
+
 	touch ChangeLog || die
 	eautoreconf
 }