diff --git a/media-gfx/mayo/mayo-0.8.0.ebuild b/media-gfx/mayo/mayo-0.8.0.ebuild
index c8b8608013..8fe1a4d742 100644
--- a/media-gfx/mayo/mayo-0.8.0.ebuild
+++ b/media-gfx/mayo/mayo-0.8.0.ebuild
@@ -15,12 +15,13 @@ KEYWORDS="~amd64"
 
 RDEPEND="
 	>=sci-libs/opencascade-7.7.0-r2
-	<sci-libs/opencascade-7.7.1
+	<sci-libs/opencascade-7.8.0
 	dev-qt/qtcore:5
 	dev-qt/qtgui:5
 	dev-qt/qtwidgets:5
 	>=media-libs/assimp-5.3.1
 "
+BDEPEND="sys-devel/gcc:13"
 
 DEPEND="${RDEPEND}"
 
@@ -28,6 +29,19 @@ PATCHES=(
 	"${FILESDIR}"/${P}-nogit.patch
 )
 
+pkg_pretend() {
+	# https://bugs.gentoo.org/935121
+	if tc-is-gcc && ver_test $(gcc-version) -ne 13 ; then
+		ewarn "GCC 13 is not in use! Versions different to gcc-13 are known to fail to compile."
+		ewarn "That is so even when any gcc >= 9 should work according to upstream."
+		ewarn "See https://bugs.gentoo.org/935121"
+	elif tc-is-clang; then
+		ewarn "LLVM/Clang >= 6 should work according to upstream but it is untested."
+		ewarn "If compilation fails, gcc-13 is known to work."
+		ewarn "See https://bugs.gentoo.org/935121"
+	fi
+}
+
 src_configure() {
 	eqmake5 "CASCADE_INC_DIR=/usr/include/opencascade" "CASCADE_LIB_DIR=/usr/$(get_libdir)/opencascade" "ASSIMP_INC_DIR=/usr/include/assimp" "ASSIMP_LIB_DIR=/usr/$(get_libdir)" mayo.pro
 }