diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild
index d15e3bf4e5041..279753c191f1c 100644
--- a/sys-libs/glibc/glibc-9999.ebuild
+++ b/sys-libs/glibc/glibc-9999.ebuild
@@ -35,9 +35,9 @@ GCC_BOOTSTRAP_VER=20201208
 LOCALE_GEN_VER=2.10
 
 SRC_URI+=" https://gitweb.gentoo.org/proj/locale-gen.git/snapshot/locale-gen-${LOCALE_GEN_VER}.tar.gz"
-SRC_URI+=" multilib? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
+SRC_URI+=" multilib-bootstrap? ( https://dev.gentoo.org/~dilfridge/distfiles/gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz )"
 
-IUSE="audit caps cet compile-locales +crypt custom-cflags doc gd headers-only +multiarch multilib nscd profile selinux +ssp +static-libs static-pie suid systemtap test vanilla"
+IUSE="audit caps cet compile-locales +crypt custom-cflags doc gd headers-only +multiarch multilib multilib-bootstrap nscd profile selinux +ssp +static-libs static-pie suid systemtap test vanilla"
 
 # Minimum kernel version that glibc requires
 MIN_KERN_VER="3.2.0"
@@ -743,7 +743,7 @@ src_unpack() {
 	# Consistency is not guaranteed between pkg_ and src_ ...
 	sanity_prechecks
 
-	use multilib && unpack gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz
+	use multilib-bootstrap && unpack gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}.tar.xz
 
 	setup_env
 
@@ -990,7 +990,7 @@ glibc_do_configure() {
 	# is built with MULTILIB_ABIS="amd64 x86" but we want to
 	# add x32 to it, gcc/glibc don't yet support x32.
 	#
-	if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib ; then
+	if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib-bootstrap ; then
 		echo 'main(){}' > "${T}"/test.c
 		if ! $(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS} "${T}"/test.c -Wl,-emain -lgcc 2>/dev/null ; then
 			sed -i -e '/^CC = /s:$: -B$(objdir)/../'"gcc-multilib-bootstrap-${GCC_BOOTSTRAP_VER}/${ABI}:" config.make || die
diff --git a/sys-libs/glibc/metadata.xml b/sys-libs/glibc/metadata.xml
index 6630fde73e7fe..7dc64b63ddea4 100644
--- a/sys-libs/glibc/metadata.xml
+++ b/sys-libs/glibc/metadata.xml
@@ -12,6 +12,7 @@
  <flag name="debug">When USE=hardened, allow fortify/stack violations to dump core (SIGABRT) and not kill self (SIGKILL)</flag>
  <flag name="gd">build memusage and memusagestat tools</flag>
  <flag name="multiarch">enable optimizations for multiple CPU architectures (detected at runtime)</flag>
+ <flag name="multilib-bootstrap">Provide prebuilt libgcc.a and crt files if missing. Only needed for ABI switch.</flag>
  <flag name="nscd">Build, and enable support for, the Name Service Cache Daemon</flag>
  <flag name="rpc">Enable obsolete RPC/NIS layers</flag>
  <flag name="ssp">protect stack of glibc internals</flag>