--- glibc-2.26-r4.ebuild.orig	2017-12-21 22:01:26.000000000 +0100
+++ glibc-2.26-r4.ebuild	2017-12-29 23:47:36.000000000 +0100
@@ -109,6 +109,14 @@
 # the phases
 #
 
+noncross_eprefix() {
+	is_crosscompile || echo "${EPREFIX}"
+}
+
+cross_eprefix() {
+	is_crosscompile && echo "${EPREFIX}"
+}
+
 pkg_pretend() {
 	# Make sure devpts is mounted correctly for use w/out setuid pt_chown
 	check_devpts
@@ -236,6 +244,8 @@
 		einfo "Done."
 	fi
 
+	epatch "${FILESDIR}"/${PN}-2.25-case-insensitive-fs.patch
+
 	if just_headers ; then
 		if [[ -e ports/sysdeps/mips/preconfigure ]] ; then
 			# mips peeps like to screw with us.  if building headers,
@@ -398,9 +408,9 @@
 		$(use_enable profile)
 		$(use_with gd)
 		--with-headers=$(alt_build_headers)
-		--prefix="${EPREFIX}/usr"
-		--sysconfdir="${EPREFIX}/etc"
-		--localstatedir="${EPREFIX}/var"
+		--prefix="$(noncross_eprefix)/usr"
+		--sysconfdir="$(noncross_eprefix)/etc"
+		--localstatedir="$(noncross_eprefix)/var"
 		--libdir='$(prefix)'/$(get_libdir)
 		--mandir='$(prefix)'/share/man
 		--infodir='$(prefix)'/share/info
@@ -422,8 +432,8 @@
 
 	# There is no configure option for this and we need to export it
 	# since the glibc build will re-run configure on itself
-	export libc_cv_rootsbindir="${EPREFIX}/sbin"
-	export libc_cv_slibdir="${EPREFIX}/$(get_libdir)"
+	export libc_cv_rootsbindir="$(noncross_eprefix)/sbin"
+	export libc_cv_slibdir="$(noncross_eprefix)/$(get_libdir)"
 
 	# We take care of patching our binutils to use both hash styles,
 	# and many people like to force gnu hash style only, so disable
@@ -469,6 +479,8 @@
 	mkdir -p "${builddir}"
 	cd "${builddir}"
 
+	export CC="$(tc-getCC ${CTARGET})"
+	if ! $CC -v >/dev/null ; then
 	# if we don't have a compiler yet, we can't really test it now ...
 	# hopefully they don't affect header generation, so let's hope for
 	# the best here ...
@@ -504,6 +516,8 @@
 		einfo " ${v}"
 		export ${v}
 	done
+	export CC="$(tc-getBUILD_CC)"
+	fi
 
 	# Blow away some random CC settings that screw things up. #550192
 	if [[ -d ${S}/sysdeps/mips ]]; then
@@ -531,7 +545,7 @@
 		--build=${CBUILD_OPT:-${CBUILD}}
 		--host=${CTARGET_OPT:-${CTARGET}}
 		--with-headers=$(alt_build_headers)
-		--prefix="${EPREFIX}/usr"
+		--prefix="$(noncross_eprefix)/usr"
 		${EXTRA_ECONF}
 	)
 
@@ -543,7 +557,6 @@
 	# So forcing CC/CFLAGS is sane.
 	set -- "${S}"/configure "${myconf[@]}"
 	echo "$@"
-	CC="$(tc-getBUILD_CC)" \
 	CFLAGS="-O1 -pipe" \
 	CPPFLAGS="-U_FORTIFY_SOURCE" \
 	LDFLAGS="" \
@@ -599,7 +612,7 @@
 	local builddir=$(builddir nptl)
 	cd "${builddir}"
 
-	emake install_root="${D}$(alt_prefix)" install || die
+	emake install_root="${D}$(cross_eprefix)$(alt_prefix)" install || die
 
 	# This version (2.26) provides some compatibility libraries for the NIS/NIS+ support
 	# which come without headers etc. Only needed for binary packages since the
@@ -762,7 +775,7 @@
 glibc_headers_install() {
 	local builddir=$(builddir "headers")
 	cd "${builddir}"
-	emake install_root="${D}$(alt_prefix)" install-headers
+	emake install_root="${D}$(cross_eprefix)$(alt_prefix)" install-headers
 
 	insinto $(alt_headers)/gnu
 	doins "${S}"/include/gnu/stubs.h