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diff --git a/eclass/vala.eclass b/eclass/vala.eclass
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+# Copyright 1999-2014 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+# @ECLASS: vala.eclass
+# @MAINTAINER:
+# gnome@gentoo.org
+# @AUTHOR:
+# Alexandre Rostovtsev <tetromino@gentoo.org>
+# @BLURB: Sets up the environment for using a specific version of vala.
+# @DESCRIPTION:
+# This eclass sets up commonly used environment variables for using a specific
+# version of dev-lang/vala to configure and build a package. It is needed for
+# packages whose build systems assume the existence of certain unversioned vala
+# executables, pkgconfig files, etc., which Gentoo does not provide.
+#
+# This eclass provides one phase function: src_prepare.
+
+inherit eutils multilib
+
+case "${EAPI:-0}" in
+	0)	die "EAPI=0 is not supported" ;;
+	1)	;;
+	*)	EXPORT_FUNCTIONS src_prepare ;;
+esac
+
+# @ECLASS-VARIABLE: VALA_MIN_API_VERSION
+# @DESCRIPTION:
+# Minimum vala API version (e.g. 0.20).
+VALA_MIN_API_VERSION=${VALA_MIN_API_VERSION:-0.20}
+
+# @ECLASS-VARIABLE: VALA_MAX_API_VERSION
+# @DESCRIPTION:
+# Maximum vala API version (e.g. 0.26).
+VALA_MAX_API_VERSION=${VALA_MAX_API_VERSION:-0.26}
+
+# @ECLASS-VARIABLE: VALA_USE_DEPEND
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# USE dependencies that vala must be built with (e.g. vapigen).
+
+# @FUNCTION: vala_api_versions
+# @DESCRIPTION:
+# Outputs a list of vala API versions from VALA_MAX_API_VERSION down to
+# VALA_MIN_API_VERSION.
+vala_api_versions() {
+	[[ ${VALA_MIN_API_VERSION} =~ ^0\.[[:digit:]]+$ ]] || die "Invalid syntax of VALA_MIN_API_VERSION"
+	[[ ${VALA_MAX_API_VERSION} =~ ^0\.[[:digit:]]+$ ]] || die "Invalid syntax of VALA_MAX_API_VERSION"
+
+	local minimal_supported_minor_version minor_version
+
+	# Dependency atoms are not generated for Vala versions older than 0.${minimal_supported_minor_version}.
+	minimal_supported_minor_version="20"
+
+	for ((minor_version = ${VALA_MAX_API_VERSION#*.}; minor_version >= ${VALA_MIN_API_VERSION#*.}; minor_version = minor_version - 2)); do
+		if ((minor_version >= minimal_supported_minor_version)); then
+			echo "0.${minor_version}"
+		fi
+	done
+}
+
+# @FUNCTION: vala_depend
+# @DESCRIPTION:
+# Outputs a ||-dependency string on vala from VALA_MAX_API_VERSION down to
+# VALA_MIN_API_VERSION
+vala_depend() {
+	local u v versions=$(vala_api_versions)
+	[[ ${VALA_USE_DEPEND} ]] && u="[${VALA_USE_DEPEND}(+)]"
+
+	echo -n "|| ("
+	for v in ${versions}; do
+		echo -n " dev-lang/vala:${v}${u}"
+	done
+	echo " )"
+}
+
+# @FUNCTION: vala_best_api_version
+# @DESCRIPTION:
+# Returns the highest installed vala API version satisfying
+# VALA_MAX_API_VERSION, VALA_MIN_API_VERSION, and VALA_USE_DEPEND.
+vala_best_api_version() {
+	local u v
+	[[ ${VALA_USE_DEPEND} ]] && u="[${VALA_USE_DEPEND}(+)]"
+	for v in $(vala_api_versions); do
+		has_version "dev-lang/vala:${v}${u}" && echo "${v}" && return
+	done
+}
+
+# @FUNCTION: vala_src_prepare
+# @USAGE: [--ignore-use] [--vala-api-version api_version]
+# @DESCRIPTION:
+# Sets up the environment variables and pkgconfig files for the
+# specified API version, or, if no version is specified, for the
+# highest installed vala API version satisfying
+# VALA_MAX_API_VERSION, VALA_MIN_API_VERSION, and VALA_USE_DEPEND.
+# Is a no-op if called without --ignore-use when USE=-vala.
+# Dies if the USE check is passed (or ignored) and a suitable vala
+# version is not available.
+vala_src_prepare() {
+	local p d valafoo version ignore_use
+
+	while [[ $1 ]]; do
+		case $1 in
+			"--ignore-use" )
+				ignore_use=1 ;;
+			"--vala-api-version" )
+				shift
+				version=$1
+				[[ ${version} ]] || die "'--vala-api-version' option requires API version parameter."
+		esac
+		shift
+	done
+
+	if [[ -z ${ignore_use} ]]; then
+		in_iuse vala && ! use vala && return 0
+	fi
+
+	if [[ ${version} ]]; then
+		has_version "dev-lang/vala:${version}" || die "No installed vala:${version}"
+	else
+		version=$(vala_best_api_version)
+		[[ ${version} ]] || die "No installed vala in $(vala_depend)"
+	fi
+
+	export VALAC=$(type -P valac-${version})
+
+	valafoo=$(type -P vala-gen-introspect-${version})
+	[[ ${valafoo} ]] && export VALA_GEN_INTROSPECT="${valafoo}"
+
+	valafoo=$(type -P vapigen-${version})
+	[[ ${valafoo} ]] && export VAPIGEN="${valafoo}"
+
+	valafoo="${EPREFIX}/usr/share/vala/Makefile.vapigen"
+	[[ -e ${valafoo} ]] && export VAPIGEN_MAKEFILE="${valafoo}"
+
+	export VAPIGEN_VAPIDIR="${EPREFIX}/usr/share/vala/vapi"
+
+	mkdir -p "${T}/pkgconfig" || die "mkdir failed"
+	for p in libvala vapigen; do
+		for d in "${EPREFIX}/usr/$(get_libdir)/pkgconfig" "${EPREFIX}/usr/share/pkgconfig"; do
+			if [[ -e ${d}/${p}-${version}.pc ]]; then
+				ln -s "${d}/${p}-${version}.pc" "${T}/pkgconfig/${p}.pc" || die "ln failed"
+				break
+			fi
+		done
+	done
+	: ${PKG_CONFIG_PATH:="${EPREFIX}/usr/$(get_libdir)/pkgconfig:${EPREFIX}/usr/share/pkgconfig"}
+	export PKG_CONFIG_PATH="${T}/pkgconfig:${PKG_CONFIG_PATH}"
+}