diff --git a/sci-physics/hepmc/hepmc-3.2.7.ebuild b/sci-physics/hepmc/hepmc-3.2.7.ebuild
index 2c4ebb1160074..4074958aea33a 100644
--- a/sci-physics/hepmc/hepmc-3.2.7.ebuild
+++ b/sci-physics/hepmc/hepmc-3.2.7.ebuild
@@ -4,7 +4,7 @@
 EAPI=8
 
 PYTHON_COMPAT=( python3_{10..12} )
-inherit fortran-2 cmake python-single-r1
+inherit fortran-2 cmake flag-o-matic python-single-r1
 
 MYPN=HepMC3
 MYP=${MYPN}-${PV}
@@ -47,6 +47,7 @@ BDEPEND="
 "
 
 src_configure() {
+	filter-lto # 941937 941936
 	local mycmakeargs=(
 		-DHEPMC3_ENABLE_ROOTIO=$(usex root ON OFF)
 		-DHEPMC3_ENABLE_PYTHON=$(usex python ON OFF)
diff --git a/sci-physics/hepmc/hepmc-3.3.0.ebuild b/sci-physics/hepmc/hepmc-3.3.0.ebuild
index 788d8d48adf54..c5cb24ef7a3f8 100644
--- a/sci-physics/hepmc/hepmc-3.3.0.ebuild
+++ b/sci-physics/hepmc/hepmc-3.3.0.ebuild
@@ -4,7 +4,7 @@
 EAPI=8
 
 PYTHON_COMPAT=( python3_{10..12} )
-inherit fortran-2 cmake python-single-r1
+inherit fortran-2 cmake flag-o-matic python-single-r1
 
 MYP=HepMC3-${PV}
 
@@ -46,6 +46,7 @@ BDEPEND="
 "
 
 src_configure() {
+	filter-lto # 941937 941936
 	local mycmakeargs=(
 		-DHEPMC3_ENABLE_ROOTIO=$(usex root ON OFF)
 		-DHEPMC3_ENABLE_PYTHON=$(usex python ON OFF)
diff --git a/sci-physics/hepmc/hepmc-9999.ebuild b/sci-physics/hepmc/hepmc-9999.ebuild
index 788d8d48adf54..c5cb24ef7a3f8 100644
--- a/sci-physics/hepmc/hepmc-9999.ebuild
+++ b/sci-physics/hepmc/hepmc-9999.ebuild
@@ -4,7 +4,7 @@
 EAPI=8
 
 PYTHON_COMPAT=( python3_{10..12} )
-inherit fortran-2 cmake python-single-r1
+inherit fortran-2 cmake flag-o-matic python-single-r1
 
 MYP=HepMC3-${PV}
 
@@ -46,6 +46,7 @@ BDEPEND="
 "
 
 src_configure() {
+	filter-lto # 941937 941936
 	local mycmakeargs=(
 		-DHEPMC3_ENABLE_ROOTIO=$(usex root ON OFF)
 		-DHEPMC3_ENABLE_PYTHON=$(usex python ON OFF)