diff --git a/x11-libs/fltk/fltk-1.3.5-r4.ebuild b/x11-libs/fltk/fltk-1.3.5-r4.ebuild
index e21dcd6f8914d..ad957e1047139 100644
--- a/x11-libs/fltk/fltk-1.3.5-r4.ebuild
+++ b/x11-libs/fltk/fltk-1.3.5-r4.ebuild
@@ -93,6 +93,11 @@ src_prepare() {
 }
 
 multilib_src_configure() {
+	# -Werror=odr
+	# https://bugs.gentoo.org/881107
+	# Seems to be fixed in git (1.4.9999)
+	filter-lto
+
 	unset FLTK_LIBDIRS
 
 	local FLTK_INCDIR=${EPREFIX}/usr/include/fltk
diff --git a/x11-libs/fltk/fltk-1.3.8.ebuild b/x11-libs/fltk/fltk-1.3.8.ebuild
index b287bf5fb2514..710e3997f2a95 100644
--- a/x11-libs/fltk/fltk-1.3.8.ebuild
+++ b/x11-libs/fltk/fltk-1.3.8.ebuild
@@ -98,6 +98,11 @@ src_prepare() {
 }
 
 multilib_src_configure() {
+	# -Werror=odr
+	# https://bugs.gentoo.org/881107
+	# Seems to be fixed in git (1.4.9999)
+	filter-lto
+
 	unset FLTK_LIBDIRS
 
 	local FLTK_INCDIR=${EPREFIX}/usr/include/fltk
diff --git a/x11-libs/fltk/fltk-1.3.9999.ebuild b/x11-libs/fltk/fltk-1.3.9999.ebuild
index ddbc8c24006cd..8362de1289710 100644
--- a/x11-libs/fltk/fltk-1.3.9999.ebuild
+++ b/x11-libs/fltk/fltk-1.3.9999.ebuild
@@ -99,6 +99,11 @@ src_prepare() {
 }
 
 multilib_src_configure() {
+	# -Werror=odr
+	# https://bugs.gentoo.org/881107
+	# Seems to be fixed in git (1.4.9999)
+	filter-lto
+
 	local FLTK_INCDIR=${EPREFIX}/usr/include/fltk
 	local FLTK_LIBDIR=${EPREFIX}/usr/$(get_libdir)/fltk
 	FLTK_LIBDIRS+=${FLTK_LIBDIRS+:}${FLTK_LIBDIR}