--- python-3.5.5.ebuild 2018-04-18 05:08:59.000000000 +0200
+++ python-3.5.5-r1.ebuild      2018-04-19 10:47:14.240755854 +0200
@@ -17,7 +17,7 @@ SRC_URI="https://www.python.org/ftp/pyth
 LICENSE="PSF-2"
 SLOT="3.5/3.5m"
 KEYWORDS="~alpha amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc x86 ~amd64-fbsd ~x86-fbsd"
-IUSE="build elibc_uclibc examples gdbm hardened ipv6 libressl +ncurses +readline sqlite +ssl test +threads tk wininst +xml"
+IUSE="build elibc_uclibc examples gdbm hardened ipv6 libressl +ncurses +readline sqlite +ssl test +threads tk wininst +xml pgo"
 RESTRICT="!test? ( test )"
 
 # Do not add a dependency on dev-lang/python to this ebuild.
@@ -178,8 +178,11 @@ src_compile() {
        local -x LC_ALL=C
 
        cd "${BUILD_DIR}" || die
-
-       emake CPPFLAGS= CFLAGS= LDFLAGS=
+       if use pgo; then
+               emake profile-opt PROFILE_TASK="-m test.regrtest -w -uall,-audio -x test_gdb test_multiprocessing test_subprocess test_tokenize test_signal test_faulthandler test_asyncio test_compileall test_pyexpat test_runpy test_support test_threaded_import test_xmlrpc_net"
+       else
+               emake CPPFLAGS= CFLAGS= LDFLAGS=
+       fi
 
        # Work around bug 329499. See also bug 413751 and 457194.
        if has_version dev-libs/libffi[pax_kernel]; then