diff --git a/media-libs/glm/files/glm-0.9.9.8-clang.patch b/media-libs/glm/files/glm-0.9.9.8-clang.patch
new file mode 100644
index 0000000000000..af763d5b452a8
--- /dev/null
+++ b/media-libs/glm/files/glm-0.9.9.8-clang.patch
@@ -0,0 +1,11 @@
+--- a/test/CMakeLists.txt	2020-07-07 08:44:31.304955458 +0200
++++ b/test/CMakeLists.txt	2020-07-07 08:44:38.962844309 +0200
+@@ -197,7 +197,7 @@
+ 		message("GLM: Clang - ${CMAKE_CXX_COMPILER_ID} compiler")
+ 	endif()
+ 
+-	add_compile_options(-Werror -Weverything)
++	add_compile_options(-Weverything)
+ 	add_compile_options(-Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-c++11-long-long -Wno-padded -Wno-gnu-anonymous-struct -Wno-nested-anon-types)
+ 	add_compile_options(-Wno-undefined-reinterpret-cast -Wno-sign-conversion -Wno-unused-variable -Wno-missing-prototypes -Wno-unreachable-code -Wno-missing-variable-declarations -Wno-sign-compare -Wno-global-constructors -Wno-unused-macros -Wno-format-nonliteral)
+ 
diff --git a/media-libs/glm/glm-0.9.9.8.ebuild b/media-libs/glm/glm-0.9.9.8.ebuild
index dcd6a2c591184..6fd8711eea6d8 100644
--- a/media-libs/glm/glm-0.9.9.8.ebuild
+++ b/media-libs/glm/glm-0.9.9.8.ebuild
@@ -19,6 +19,7 @@ RDEPEND=""
 
 PATCHES=(
 	"${FILESDIR}"/${PN}-0.9.9.6-simd.patch
+	"${FILESDIR}"/${P}-clang.patch
 )
 
 src_prepare() {