diff --git a/dev-libs/nspr/Manifest b/dev-libs/nspr/Manifest
index 505d199..d095fac 100644
--- a/dev-libs/nspr/Manifest
+++ b/dev-libs/nspr/Manifest
@@ -1 +1,2 @@
 DIST nspr-4.12.tar.gz 1135458 SHA256 e0b10a1e569153668ff8bdea6c7e491b389fab69c2f18285a1ebf7c2ea4269de SHA512 138072be98dea6e97ea38f3e562c8ee383626c2136ec1adb854a81315468cd484c4b994c3ccaf6a39327b3fe121f77d698bf85c2764ec4b6231828b8a9ec5460 WHIRLPOOL d85d74e6287ed9578bc565c5e699f7201fbf38cb55e6dfa487f1c8b4684c161b6c6a5c8cb06627575d7a417bf35b15c64d231878dab32b5bbcc8223b7356c32d
+DIST nspr-4.13.1.tar.gz 1136646 SHA256 5e4c1751339a76e7c772c0c04747488d7f8c98980b434dc846977e43117833ab SHA512 4755dce1a0fddbf4991f46328bdd15b6b07162792370953e16481be56952d4c02d11a83001b3600c80a919b1c45e99d6150ef2c24d407c86f430f9376fe6a694 WHIRLPOOL aa0b9731eb11b8418fced5a1ce52c801657dc738cba0f198fa4b685296e321dd168de8d4ba04335695ac1c6c345563b60e2a49af9a30069d301712c0c1c51f83
diff --git a/dev-libs/nspr/nspr-4.13.1.ebuild b/dev-libs/nspr/nspr-4.13.1.ebuild
new file mode 100644
index 0000000..cc2f965
--- /dev/null
+++ b/dev-libs/nspr/nspr-4.13.1.ebuild
@@ -0,0 +1,125 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+WANT_AUTOCONF="2.5"
+
+inherit autotools eutils multilib toolchain-funcs versionator multilib-minimal
+
+MIN_PV="$(get_version_component_range 2)"
+
+DESCRIPTION="Netscape Portable Runtime"
+HOMEPAGE="http://www.mozilla.org/projects/nspr/"
+SRC_URI="https://archive.mozilla.org/pub/nspr/releases/v${PV}/src/${P}.tar.gz"
+
+LICENSE="|| ( MPL-2.0 GPL-2 LGPL-2.1 )"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~ppc-aix ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~x64-macos ~x86-macos ~sparc-solaris ~x64-solaris ~x86-solaris"
+IUSE="debug"
+
+RDEPEND="
+	abi_x86_32? (
+		!<=app-emulation/emul-linux-x86-baselibs-20140508-r12
+		!app-emulation/emul-linux-x86-baselibs[-abi_x86_32(-)]
+	)"
+
+MULTILIB_CHOST_TOOLS=(
+	/usr/bin/nspr-config
+)
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-4.7.0-prtime.patch
+	"${FILESDIR}"/${PN}-4.7.1-solaris.patch
+	"${FILESDIR}"/${PN}-4.10.6-solaris.patch
+	"${FILESDIR}"/${PN}-4.8.4-darwin-install_name.patch
+	"${FILESDIR}"/${PN}-4.8.9-link-flags.patch
+	# We do not need to pass -L$libdir via nspr-config --libs
+	"${FILESDIR}"/${PN}-4.9.5_nspr_config.patch
+)
+
+src_prepare() {
+	cd "${S}"/nspr || die
+
+	default
+
+	# rename configure.in to configure.ac for new autotools compatibility
+	if [[ -e "${S}"/nspr/configure.in ]] ; then
+		einfo "Renaming configure.in to configure.ac"
+		mv "${S}"/nspr/configure.{in,ac} || die
+	fi
+	# We must run eautoconf to regenerate configure
+	eautoconf
+
+	# make sure it won't find Perl out of Prefix
+	sed -i -e "s/perl5//g" "${S}"/nspr/configure || die
+
+	# Respect LDFLAGS
+	sed -i -e 's/\$(MKSHLIB) \$(OBJS)/\$(MKSHLIB) \$(LDFLAGS) \$(OBJS)/g' \
+		"${S}"/nspr/config/rules.mk || die
+}
+
+multilib_src_configure() {
+	# We use the standard BUILD_xxx but nspr uses HOST_xxx
+	tc-export_build_env BUILD_CC
+	export HOST_CC=${BUILD_CC} HOST_CFLAGS=${BUILD_CFLAGS} HOST_LDFLAGS=${BUILD_LDFLAGS}
+	tc-export AR CC CXX RANLIB
+	[[ ${CBUILD} != ${CHOST} ]] \
+		&& export CROSS_COMPILE=1 \
+		|| unset CROSS_COMPILE
+
+	local myconf=()
+
+	# The configure has some fancy --enable-{{n,x}32,64bit} switches
+	# that trigger some code conditional to platform & arch. This really
+	# matters for the few common arches (x86, ppc) but we pass a little
+	# more of them to be future-proof.
+
+	# use ABI first, this will work for most cases
+	case "${ABI}" in
+		alpha|arm|hppa|m68k|o32|ppc|s390|sh|sparc|x86) ;;
+		n32) myconf+=( --enable-n32 );;
+		x32) myconf+=( --enable-x32 );;
+		s390x|*64) myconf+=( --enable-64bit );;
+		default) # no abi actually set, fall back to old check
+			einfo "Running a short build test to determine 64bit'ness"
+			echo > "${T}"/test.c || die
+			${CC} ${CFLAGS} ${CPPFLAGS} -c "${T}"/test.c -o "${T}"/test.o || die
+			case $(file "${T}"/test.o) in
+				*32-bit*x86-64*) myconf+=( --enable-x32 );;
+				*64-bit*|*ppc64*|*x86_64*) myconf+=( --enable-64bit );;
+				*32-bit*|*ppc*|*i386*) ;;
+				*) die "Failed to detect whether your arch is 64bits or 32bits, disable distcc if you're using it, please";;
+			esac ;;
+		*) ;;
+	esac
+
+	# Ancient autoconf needs help finding the right tools.
+	LC_ALL="C" ECONF_SOURCE="${S}/nspr" \
+	ac_cv_path_AR="${AR}" \
+	econf \
+		--libdir="${EPREFIX}/usr/$(get_libdir)" \
+		$(use_enable debug) \
+		$(use_enable !debug optimize) \
+		"${myconf[@]}"
+}
+
+multilib_src_install() {
+	# Their build system is royally confusing, as usual
+	MINOR_VERSION=${MIN_PV} # Used for .so version
+	emake DESTDIR="${D}" install
+
+	einfo "removing static libraries as upstream has requested!"
+	rm -f "${ED}"/usr/$(get_libdir)/*.a || die "failed to remove static libraries."
+
+	# install nspr-config
+	dobin config/nspr-config
+
+	# Remove stupid files in /usr/bin
+	rm "${ED}"/usr/bin/prerr.properties || die
+
+	# This is used only to generate prerr.c and prerr.h at build time.
+	# No other projects use it, and we don't want to depend on perl.
+	# Talked to upstream and they agreed w/punting.
+	rm "${ED}"/usr/bin/compile-et.pl || die
+}