--- src/Makefile.in.orig	2019-10-27 17:26:24.000000000 -0500
+++ src/Makefile.in	2019-10-30 05:57:32.000000000 -0500
@@ -130,7 +130,7 @@
 CDEBUGFLAGS := -g
 INCLUDE := -I"$(MWROOT)/extern/include" -I"$(MWROOT)/simulink/include"
 LD := gcc
-LDFLAGS := -pthread -Wl,--no-undefined 
+LDFLAGS := -pthread -Wl,-undefined,error 
 LDTYPE := -shared
 LINKEXPORTVER := -Wl,--version-script,"$(MWROOT)/extern/lib/glnxa64/c_exportsmexfileversion.map"
 LINKLIBS := -Wl,--as-needed -Wl,-rpath-link,$(MWROOT)/bin/glnxa64 -L"$(MWROOT)/bin/glnxa64" -Wl,-rpath-link,$(MWROOT)/extern/bin/glnxa64 -L"$(MWROOT)/extern/bin/glnxa64" -lmx -lmex     -lmat -lm -lstdc++