diff -Nurd mujs-1.3.3.orig/Makefile mujs-1.3.3/Makefile
--- mujs-1.3.3.orig/Makefile	2023-01-10 06:11:11.000000000 -0500
+++ mujs-1.3.3/Makefile	2023-09-17 01:37:37.000000000 -0400
@@ -21,13 +21,15 @@
 
 ifeq ($(shell uname),Darwin)
   SO = dylib
+  SOVER = 3.$(SO)
+  DYLD = -dynamiclib -install_name $(libdir)/libmujs.$(SOVER) -compatibility_version 4.0.0
 else
   SO = so
+  SOVER = $(SO).3
+  DYLD = -shared
 endif
 
-ifeq ($(shell uname),FreeBSD)
-  CFLAGS += -I/usr/local/include -L/usr/local/lib
-endif
+CFLAGS += $(CPPFLAGS) $(LDFLAGS)
 
 HDRS = mujs.h jsi.h regexp.h utf.h astnames.h opnames.h
 
@@ -79,7 +81,7 @@
 
 build/debug/libmujs.$(SO): one.c $(SRCS) $(HDRS)
 	@mkdir -p $(@D)
-	$(CC) $(CFLAGS) -g -fPIC -shared -o $@ one.c -lm
+	$(CC) $(CFLAGS) -g -fPIC $(DYLD) -o $@ one.c -lm
 build/debug/libmujs.o: one.c $(SRCS) $(HDRS)
 	@mkdir -p $(@D)
 	$(CC) $(CFLAGS) -g -c -o $@ one.c
@@ -92,7 +94,7 @@
 
 build/release/libmujs.$(SO): one.c $(SRCS) $(HDRS)
 	@mkdir -p $(@D)
-	$(CC) $(CFLAGS) $(OPTIM) -fPIC -shared -o $@ one.c -lm
+	$(CC) $(CFLAGS) $(OPTIM) -fPIC $(DYLD) -o $@ one.c -lm
 build/release/libmujs.o: one.c $(SRCS) $(HDRS)
 	@mkdir -p $(@D)
 	$(CC) $(CFLAGS) $(OPTIM) -c -o $@ one.c
@@ -112,7 +114,8 @@
 	echo >> $@ Libs: -L$(libdir) -lmujs
 	echo >> $@ Libs.private: -lm
 
-install-common: build/release/mujs build/release/mujs-pp build/release/mujs.pc
+build-common: build/release/mujs build/release/mujs-pp build/release/mujs.pc
+install-common: build-common
 	install -d $(DESTDIR)$(incdir)
 	install -d $(DESTDIR)$(libdir)
 	install -d $(DESTDIR)$(libdir)/pkgconfig
@@ -125,8 +128,11 @@
 install-static: install-common build/release/libmujs.a
 	install -m 644 build/release/libmujs.a $(DESTDIR)$(libdir)
 
-install-shared: install-common build/release/libmujs.$(SO)
-	install -m 755 build/release/libmujs.$(SO) $(DESTDIR)$(libdir)
+build-shared: build-common build/release/libmujs.$(SO)
+
+install-shared: install-common build-shared
+	install -m 755 build/release/libmujs.$(SO) $(DESTDIR)$(libdir)/libmujs.$(SOVER)
+	ln -s libmujs.$(SOVER) $(DESTDIR)$(libdir)/libmujs.$(SO)
 
 install: install-static