1. "host/tools/gentest/gentest" is needed for cross test;
 2. Dropping "#define U_DISABLE_RENAMING 1" is not good;
 3. Build log should be verbose by default.

--- icu-50_rc-r2.ebuild	2012-11-04 12:26:19.000000000 +0000
+++ icu-50_rc-r2.ebuild	2012-11-04 22:49:35.665130693 +0000
@@ -4,11 +4,7 @@
 
 EAPI=5
 
-BASE_URI="http://download.icu-project.org/files/icu4c/${PV/_/}"
-SRC_ARCHIVE="icu4c-${PV//./_}-src.tgz"
-DOCS_ARCHIVE="icu4c-${PV//./_}-docs.zip"
-
-inherit eutils toolchain-funcs versionator base
+inherit autotools eutils toolchain-funcs versionator base
 
 MAJOR_VERSION="$(get_version_component_range 1)"
 if [[ ${PV/_rc/} != ${PV} ]]; then
@@ -19,17 +15,14 @@ fi
 
 DESCRIPTION="International Components for Unicode"
 HOMEPAGE="http://www.icu-project.org/"
-
-SRC_URI="${BASE_URI}/${SRC_ARCHIVE}
-	doc? ( ${BASE_URI}/${DOCS_ARCHIVE} )
-"
+SRC_URI="http://download.icu-project.org/files/icu4c/${PV/_}/icu4c-${PV//./_}-src.tgz"
 
 LICENSE="BSD"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~hppa ~ia64 ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~amd64-fbsd ~x86-fbsd"
 IUSE="debug doc examples static-libs"
 
-DEPEND="doc? ( app-arch/unzip )"
+DEPEND="doc? ( app-doc/doxygen )"
 RDEPEND="!dev-libs/icu:0/50"
 
 S="${WORKDIR}/${PN}/source"
@@ -40,17 +33,9 @@ QA_FLAGS_IGNORED="/usr/lib.*/libicudata\
 PATCHES=(
 	"${FILESDIR}/${PN}-4.8.1-fix_binformat_fonts.patch"
 	"${FILESDIR}/${PN}-4.8.1.1-fix_ltr.patch"
+	"${FILESDIR}/${PN}-50-doc.patch"
 )
 
-src_unpack() {
-	unpack "${SRC_ARCHIVE}"
-	if use doc; then
-		mkdir -p docs
-		cd docs
-		unpack "${DOCS_ARCHIVE}"
-	fi
-}
-
 src_prepare() {
 	local variable
 
@@ -65,6 +50,10 @@ src_prepare() {
 			-i config/Makefile.inc.in \
 			|| die
 	done
+
+	sed -e "s/#define U_DISABLE_RENAMING 0/#define U_DISABLE_RENAMING 1/" -i common/unicode/uconfig.h
+
+	eautoreconf
 }
 
 src_configure() {
@@ -73,13 +62,13 @@ src_configure() {
 	# bootstrap for cross compilation
 	if tc-is-cross-compiler; then
 		CFLAGS="" CXXFLAGS="" ASFLAGS="" LDFLAGS="" \
-		CC=$(tc-getBUILD_CC) CXX=$(tc-getBUILD_CXX) AR=$(tc-getBUILD_AR) \
-		RANLIB=$(tc-getBUILD_RANLIB) LD=$(tc-getBUILD_LD) \
+		CC="$(tc-getBUILD_CC)" CXX="$(tc-getBUILD_CXX)" AR="$(tc-getBUILD_AR)" \
+		RANLIB="$(tc-getBUILD_RANLIB)" LD="$(tc-getBUILD_LD)" \
 		./configure --disable-renaming --disable-debug \
 			--disable-samples --enable-static || die
-		emake
+		emake VERBOSE=1
 		mkdir -p "${WORKDIR}/host/"
-		cp -a {bin,lib,config} "${WORKDIR}/host/"
+		cp -a {bin,lib,config,tools} "${WORKDIR}/host/"
 		emake clean
 
 		cross_opts="--with-cross-build=${WORKDIR}/host"
@@ -93,6 +82,13 @@ src_configure() {
 		${cross_opts}
 }
 
+src_compile() {
+	emake VERBOSE=1
+	if use doc; then
+		doxygen -u Doxyfile && doxygen Doxyfile || die
+	fi
+}
+
 src_test() {
 	# INTLTEST_OPTS: intltest options
 	#   -e: Exhaustive testing
@@ -112,8 +108,5 @@ src_install() {
 
 	dohtml ../readme.html
 	dodoc ../unicode-license.txt
-	if use doc; then
-		insinto /usr/share/doc/${PF}/html/api
-		doins -r "${WORKDIR}/docs/"*
-	fi
+	use doc && dohtml -p api -r doc/html/
 }