diff --git a/Makefile b/Makefile
index 3d58079..db4e8c1 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,12 @@ CONFIG_CXX_ALLOCATOR := true
 CONFIG_UBSAN := false
 CONFIG_SEAL_METADATA := false
 
+define safe_flag
+$(shell $(CC) -E $1 - </dev/null &>/dev/null && echo $1)
+endef
+
 CPPFLAGS := -D_GNU_SOURCE
-SHARED_FLAGS := -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra -Wcast-align=strict -Wcast-qual -Wwrite-strings
+SHARED_FLAGS := -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra $(call safe_flag,-Wcast-align=strict) -Wcast-qual -Wwrite-strings
 CFLAGS := -std=c11 $(SHARED_FLAGS) -Wmissing-prototypes
 CXXFLAGS := -std=c++14 $(SHARED_FLAGS)
 LDFLAGS := -Wl,-z,defs,-z,relro,-z,now,-z,nodlopen,-z,text