diff -ruN gsm-1.0-pl22-orig/Makefile gsm-1.0-pl22/Makefile
--- gsm-1.0-pl22-orig/Makefile	2022-08-04 13:46:46.000000000 -0500
+++ gsm-1.0-pl22/Makefile	2023-06-15 05:53:05.000000000 -0500
@@ -43,7 +43,7 @@
 # CC		= /usr/lang/acc
 # CCFLAGS 	= -c -O
 
-CC		= gcc -ansi -pedantic
+CC		= cc -ansi -pedantic
 CCFLAGS 	= -c -O2 -DNeedFunctionPrototypes=1 -Wall -Wno-comment
 
 LD 		= $(CC)
@@ -80,8 +80,8 @@
 
 GSM_INSTALL_ROOT = $(INSTALL_ROOT)
 GSM_INSTALL_LIB = $(GSM_INSTALL_ROOT)/lib
-GSM_INSTALL_INC = $(GSM_INSTALL_ROOT)/inc
-GSM_INSTALL_MAN = $(GSM_INSTALL_ROOT)/man/man3
+GSM_INSTALL_INC = $(GSM_INSTALL_ROOT)/include
+GSM_INSTALL_MAN = $(GSM_INSTALL_ROOT)/share/man/man3
 
 
 # Where do you want to install the toast binaries and their manpage?
@@ -91,7 +91,7 @@
 
 TOAST_INSTALL_ROOT	  = $(INSTALL_ROOT)
 TOAST_INSTALL_BIN = $(TOAST_INSTALL_ROOT)/bin
-TOAST_INSTALL_MAN = $(TOAST_INSTALL_ROOT)/man/man1
+TOAST_INSTALL_MAN = $(TOAST_INSTALL_ROOT)/share/man/man1
 
 #  Other tools
 
@@ -139,7 +139,7 @@
 
 # Targets
 
-LIBGSM	= $(LIB)/libgsm.a
+LIBGSM	= $(LIB)/libgsm.1.dylib
 
 TOAST	= $(BIN)/toast
 UNTOAST	= $(BIN)/untoast
@@ -257,7 +257,8 @@
 # Install targets
 
 GSM_INSTALL_TARGETS =	\
-		$(GSM_INSTALL_LIB)/libgsm.a		\
+		$(GSM_INSTALL_LIB)/libgsm.1.dylib		\
+		$(GSM_INSTALL_LIB)/libgsm.dylib		\
 		$(GSM_INSTALL_INC)/gsm.h		\
 		$(GSM_INSTALL_MAN)/gsm.3		\
 		$(GSM_INSTALL_MAN)/gsm_explode.3	\
@@ -301,8 +302,7 @@
 
 $(LIBGSM):	$(LIB) $(GSM_OBJECTS)
 		-rm $(RMFLAGS) $(LIBGSM)
-		$(AR) $(ARFLAGS) $(LIBGSM) $(GSM_OBJECTS)
-		$(RANLIB) $(LIBGSM)
+		$(LD) -dynamiclib -o $(LIBGSM) $(GSM_OBJECTS) -install_name $(INSTALL_ROOT)/lib/libgsm.1.dylib -compatibility_version 2.0.0
 
 
 # Toast, Untoast and Tcat -- the compress-like frontends to gsm.
@@ -332,12 +332,17 @@
 
 gsminstall:
 		-if [ x"$(GSM_INSTALL_ROOT)" != x ] ; then	\
-			make $(GSM_INSTALL_TARGETS) ;	\
+			if [ ! -d $(GSM_INSTALL_INC) ] ; then mkdir -p $(GSM_INSTALL_INC) ; fi; \
+			if [ ! -d $(GSM_INSTALL_LIB) ] ; then mkdir -p $(GSM_INSTALL_LIB) ; fi; \
+			if [ ! -d $(GSM_INSTALL_MAN) ] ; then mkdir -p $(GSM_INSTALL_MAN) ; fi; \
+			make $(GSM_INSTALL_TARGETS) INSTALL_ROOT=$(INSTALL_ROOT);	\
 		fi
 
 toastinstall:
 		-if [ x"$(TOAST_INSTALL_ROOT)" != x ]; then	\
-			make $(TOAST_INSTALL_TARGETS);	\
+			if [ ! -d $(TOAST_INSTALL_BIN) ] ; then mkdir -p $(TOAST_INSTALL_BIN) ; fi; \
+			if [ ! -d $(TOAST_INSTALL_MAN) ] ; then mkdir -p $(TOAST_INSTALL_MAN) ; fi; \
+			make $(TOAST_INSTALL_TARGETS) INSTALL_ROOT=$(INSTALL_ROOT);	\
 		fi
 
 gsmuninstall:
@@ -393,11 +398,14 @@
 		cp $? $@
 		chmod 444 $@
 
-$(GSM_INSTALL_LIB)/libgsm.a:	$(LIBGSM)
+$(GSM_INSTALL_LIB)/libgsm.1.dylib:	$(LIBGSM)
 		-rm $(RMFLAGS) $@
 		cp $? $@
 		chmod 444 $@
 
+$(GSM_INSTALL_LIB)/libgsm.dylib:	$(LIBGSM)
+		-rm $(RMFLAGS) $@
+		$(LN) -s libgsm.1.dylib $@
 
 # Distribution