diff -up vendor/Makefile.old vendor/Makefile
--- vendor/Makefile.old	2024-01-10 15:37:23.308921592 +0100
+++ vendor/Makefile	2024-01-10 15:37:45.820751910 +0100
@@ -1,6 +1,6 @@
 all:
-	cd lua && $(MAKE) all MYCFLAGS="-g" && cd ..
-	cd mcmc && $(MAKE) all && cd ..
+	cd lua && $(MAKE) all MYCFLAGS="@CFLAGS@" && cd ..
+	cd mcmc && $(MAKE) all MYCFLAGS="@CFLAGS@" && cd ..
 
 clean:
 	cd lua && $(MAKE) clean && cd ..
diff -up vendor/mcmc/Makefile.old vendor/mcmc/Makefile
--- vendor/mcmc/Makefile.old	2024-01-10 15:43:11.777774397 +0100
+++ vendor/mcmc/Makefile	2024-01-10 15:46:09.679336049 +0100
@@ -1,9 +1,10 @@
 # gcc -g -Wall -Werror -pedantic -o example example.c mcmc.c
 PREFIX=/usr/local
+MYCFLAGS=
 
 all:
-	gcc -g -O2 -Wall -Werror -pedantic -o example example.c mcmc.c
-	gcc -g -O2 -Wall -Werror -pedantic -c mcmc.c
+	gcc -g -O2 -Wall -Werror -pedantic -o example example.c mcmc.c $(MYCFLAGS)
+	gcc -g -O2 -Wall -Werror -pedantic -c mcmc.c $(MYCFLAGS)
 
 clean:
 	rm -f example mcmc.o