--- a/Makefile
+++ b/Makefile
@@ -8,10 +8,12 @@ SASR	= -DSASR
 ######### Define SASR if >> is a signed arithmetic shift (-1 >> 1 == -1)
 
 # MULHACK = -DUSE_FLOAT_MUL
+MULHACK =
 ######### Define this if your host multiplies floats faster than integers,
 ######### e.g. on a SPARCstation.
 
 # FAST	= -DFAST
+FAST	=
 ######### Define together with USE_FLOAT_MUL to enable the GSM library's
 ######### approximation option for incorrect, but good-enough results.
 
@@ -22,8 +24,8 @@ LTP_CUT	=
 ######### both integer and floating point multiplications.
 ######### This flag is still in the experimental stage.
 
-WAV49	= -DWAV49
-# WAV49	=
+# WAV49	= -DWAV49
+WAV49	=
 ######### Define to enable the GSM library's option to pack GSM frames 
 ######### in the style used by the WAV #49 format.  If you want to write
 ######### a tool that produces .WAV files which contain GSM-encoded data,
@@ -44,7 +46,8 @@ WAV49	= -DWAV49
 # CCFLAGS 	= -c -O
 
 CC		= gcc -ansi -pedantic
-CCFLAGS 	= -c -O2 -DNeedFunctionPrototypes=1
+COPTS		= -O2
+CCFLAGS 	= -c $(COPTS) -DNeedFunctionPrototypes=1
 
 LD 		= $(CC)
 
@@ -78,10 +81,10 @@ INSTALL_ROOT	=
 # Leave GSM_INSTALL_ROOT empty to not install the GSM library outside of
 # this directory.
 
-GSM_INSTALL_ROOT = $(INSTALL_ROOT)
+GSM_INSTALL_ROOT = $(INSTALL_ROOT)/usr
 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?
@@ -89,14 +92,14 @@ GSM_INSTALL_MAN = $(GSM_INSTALL_ROOT)/ma
 # Leave TOAST_INSTALL_ROOT empty to not install the toast binaries outside
 # of this directory.
 
-TOAST_INSTALL_ROOT	  = $(INSTALL_ROOT)
+TOAST_INSTALL_ROOT	  = $(INSTALL_ROOT)/usr
 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
 
 SHELL		= /bin/sh
-LN		= ln
+LN		= ln -s
 BASENAME 	= basename
 AR		= ar
 ARFLAGS		= cr
@@ -126,7 +129,7 @@ INC	= $(ROOT)/inc
 
 # Flags
 
-# DEBUG	= -DNDEBUG
+DEBUG	= -DNDEBUG
 ######### Remove -DNDEBUG to enable assertions.
 
 CFLAGS	= $(CCFLAGS) $(SASR) $(DEBUG) $(MULHACK) $(FAST) $(LTP_CUT) \
@@ -140,6 +143,7 @@ LFLAGS	= $(LDFLAGS) $(LDINC)
 # Targets
 
 LIBGSM	= $(LIB)/libgsm.a
+LIBGSMSO= $(LIB)/libgsm.so
 
 TOAST	= $(BIN)/toast
 UNTOAST	= $(BIN)/untoast
@@ -258,6 +262,9 @@ STUFF = 	ChangeLog			\
 
 GSM_INSTALL_TARGETS =	\
 		$(GSM_INSTALL_LIB)/libgsm.a		\
+		$(GSM_INSTALL_LIB)/libgsm.so		\
+		$(GSM_INSTALL_LIB)/libgsm.so.1		\
+		$(GSM_INSTALL_LIB)/libgsm.so.1.0.10	\
 		$(GSM_INSTALL_INC)/gsm.h		\
 		$(GSM_INSTALL_MAN)/gsm.3		\
 		$(GSM_INSTALL_MAN)/gsm_explode.3	\
@@ -279,7 +286,7 @@ TOAST_INSTALL_TARGETS =	\
 
 # Target rules
 
-all:		$(LIBGSM) $(TOAST) $(TCAT) $(UNTOAST)
+all:		$(LIBGSM) $(LIBGSMSO) $(TOAST) $(TCAT) $(UNTOAST)
 		@-echo $(ROOT): Done.
 
 tst:		$(TST)/lin2cod $(TST)/cod2lin $(TOAST) $(TST)/test-result
@@ -299,6 +306,11 @@ install:	toastinstall gsminstall
 
 # The basic API: libgsm
 
+$(LIBGSMSO):	$(LIB) $(GSM_OBJECTS)
+		$(LD) -o $@.1.0.10 -shared -Xlinker -soname -Xlinker libgsm.so.1 $(GSM_OBJECTS) -lc
+		ln -fs libgsm.so.1.0.10 lib/libgsm.so.1
+		ln -fs libgsm.so.1.0.10 lib/libgsm.so
+
 $(LIBGSM):	$(LIB) $(GSM_OBJECTS)
 		-rm $(RMFLAGS) $(LIBGSM)
 		$(AR) $(ARFLAGS) $(LIBGSM) $(GSM_OBJECTS)
@@ -308,15 +320,15 @@ $(LIBGSM):	$(LIB) $(GSM_OBJECTS)
 # Toast, Untoast and Tcat -- the compress-like frontends to gsm.
 
 $(TOAST):	$(BIN) $(TOAST_OBJECTS) $(LIBGSM)
-		$(LD) $(LFLAGS) -o $(TOAST) $(TOAST_OBJECTS) $(LIBGSM) $(LDLIB)
+		$(LD) $(LFLAGS) -o $(TOAST) $(TOAST_OBJECTS) $(LIBGSMSO) $(LDLIB)
 
 $(UNTOAST):	$(BIN) $(TOAST)
 		-rm $(RMFLAGS) $(UNTOAST)
-		$(LN) $(TOAST) $(UNTOAST)
+		$(LN) toast $(UNTOAST)
 
 $(TCAT):	$(BIN) $(TOAST)
 		-rm $(RMFLAGS) $(TCAT)
-		$(LN) $(TOAST) $(TCAT)
+		$(LN) toast $(TCAT)
 
 
 # The local bin and lib directories
@@ -351,53 +363,66 @@ toastuninstall:
 		fi
 
 $(TOAST_INSTALL_BIN)/toast:	$(TOAST)
-		-rm $@
-		cp $(TOAST) $@
+		mkdir -p $(TOAST_INSTALL_BIN)
+		cp -f $(TOAST) $@
 		chmod 755 $@
 
 $(TOAST_INSTALL_BIN)/untoast:	$(TOAST_INSTALL_BIN)/toast
-		-rm $@
-		ln $? $@
+		mkdir -p $(TOAST_INSTALL_BIN)
+		ln -sf $? $@
 
 $(TOAST_INSTALL_BIN)/tcat:	$(TOAST_INSTALL_BIN)/toast
-		-rm $@
-		ln $? $@
+		mkdir -p $(TOAST_INSTALL_BIN)
+		ln -sf $? $@
 
 $(TOAST_INSTALL_MAN)/toast.1:	$(MAN)/toast.1
-		-rm $@
-		cp $? $@
+		mkdir -p $(TOAST_INSTALL_MAN)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_MAN)/gsm.3:	$(MAN)/gsm.3
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_MAN)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_MAN)/gsm_option.3:	$(MAN)/gsm_option.3
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_MAN)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_MAN)/gsm_explode.3:	$(MAN)/gsm_explode.3
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_MAN)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_MAN)/gsm_print.3:	$(MAN)/gsm_print.3
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_MAN)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_INC)/gsm.h:	$(INC)/gsm.h
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_INC)
+		cp -f $? $@
 		chmod 444 $@
 
 $(GSM_INSTALL_LIB)/libgsm.a:	$(LIBGSM)
-		-rm $@
-		cp $? $@
+		mkdir -p $(GSM_INSTALL_LIB)
+		cp -f $? $@
 		chmod 444 $@
 
+$(GSM_INSTALL_LIB)/libgsm.so:	$(LIBGSMSO)
+		mkdir -p $(GSM_INSTALL_LIB)
+		cp -f $? $@
+
+$(GSM_INSTALL_LIB)/libgsm.so.1:	$(LIBGSMSO)
+		mkdir -p $(GSM_INSTALL_LIB)
+		cp -f $? $@
+
+$(GSM_INSTALL_LIB)/libgsm.so.1.0.10:	$(LIBGSMSO)
+		mkdir -p $(GSM_INSTALL_LIB)
+		cp -f $? $@
+		chmod 755 $@
+
 
 # Distribution
 
@@ -426,7 +451,9 @@ semi-clean:
 
 clean:	semi-clean
 		-rm $(RMFLAGS) $(LIBGSM) $(ADDTST)/add		\
-			$(TOAST) $(TCAT) $(UNTOAST)	\
+			$(LIBGSMSO) $(LIB)/libgsm.so.1.0.10	\
+			$(LIB)libgsm.so.1			\
+			$(TOAST) $(TCAT) $(UNTOAST)		\
 			$(ROOT)/gsm-1.0.tar.Z
 
 
--- a/inc/config.h
+++ b/inc/config.h
@@ -9,8 +9,8 @@
 #ifndef	CONFIG_H
 #define	CONFIG_H
 
-/*efine	SIGHANDLER_T	int 		/* signal handlers are void	*/
-/*efine HAS_SYSV_SIGNAL	1		/* sigs not blocked/reset?	*/
+/*efine	SIGHANDLER_T	int 		*//* signal handlers are void	*/
+/*efine HAS_SYSV_SIGNAL	1		*//* sigs not blocked/reset?	*/
 
 #define	HAS_STDLIB_H	1		/* /usr/include/stdlib.h	*/
 #define	HAS_LIMITS_H	1		/* /usr/include/limits.h	*/
@@ -22,16 +22,16 @@
 #define	HAS_CHMOD 	1		/* chmod syscall		*/
 #define	HAS_FCHOWN 	1		/* fchown syscall		*/
 #define	HAS_CHOWN 	1		/* chown syscall		*/
-/*efine	HAS__FSETMODE 	1		/* _fsetmode -- set file mode	*/
+/*efine	HAS__FSETMODE 	1		*//* _fsetmode -- set file mode	*/
 
 #define	HAS_STRING_H 	1		/* /usr/include/string.h 	*/
-/*efine	HAS_STRINGS_H	1		/* /usr/include/strings.h 	*/
+/*efine	HAS_STRINGS_H	1		*//* /usr/include/strings.h 	*/
 
 #define	HAS_UNISTD_H	1		/* /usr/include/unistd.h	*/
 #define	HAS_UTIME	1		/* POSIX utime(path, times)	*/
-/*efine	HAS_UTIMES	1		/* use utimes()	syscall instead	*/
+/*efine	HAS_UTIMES	1		*//* use utimes()	syscall instead	*/
 #define	HAS_UTIME_H	1		/* UTIME header file		*/
 #define	HAS_UTIMBUF	1		/* struct utimbuf		*/
-/*efine	HAS_UTIMEUSEC   1		/* microseconds in utimbuf?	*/
+/*efine	HAS_UTIMEUSEC   1		*//* microseconds in utimbuf?	*/
 
 #endif	/* CONFIG_H */
--- a/inc/gsm.h
+++ b/inc/gsm.h
@@ -54,6 +54,10 @@ typedef gsm_byte 		gsm_frame[33];		/* 33
 #define	GSM_OPT_FRAME_INDEX	5
 #define	GSM_OPT_FRAME_CHAIN	6
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern gsm  gsm_create 	GSM_P((void));
 extern void gsm_destroy GSM_P((gsm));	
 
@@ -66,6 +70,10 @@ extern int  gsm_decode  GSM_P((gsm, gsm_
 extern int  gsm_explode GSM_P((gsm, gsm_byte   *, gsm_signal *));
 extern void gsm_implode GSM_P((gsm, gsm_signal *, gsm_byte   *));
 
+#ifdef __cplusplus
+}
+#endif
+
 #undef	GSM_P
 
 #endif	/* GSM_H */
--- a/inc/toast.h
+++ b/inc/toast.h
@@ -16,11 +16,12 @@
 
 #include <stdio.h>
 #include <ctype.h>
+#include <pthread.h>
 #include <signal.h>
 
 #include <errno.h>
-#ifndef	HAS_ERRNO_DECL
-	 extern int	errno;
+#ifndef errno
+ extern int	errno;
 #endif
 
 #ifdef	HAS_LIMITS_H
@@ -37,6 +38,10 @@
 # endif
 #endif
 
+#ifdef  HAS_STDIO_H
+# include <stdio.h>
+#endif
+
 #include "gsm.h"
 
 #ifndef	S_ISREG
--- a/src/code.c
+++ b/src/code.c
@@ -9,8 +9,8 @@
 #include	"config.h"
 
 
-#ifdef	HAS_STDLIB_H
-#include	<stdlib.h>
+#ifdef	HAS_STRING_H
+#include	<string.h>
 #else
 #	include "proto.h"
 	extern char	* memcpy P((char *, char *, int));
--- a/src/debug.c
+++ b/src/debug.c
@@ -49,7 +49,7 @@ void gsm_debug_longwords P4( (name, from
 	fprintf( stderr, "%s [%d .. %d]: ", name, from, to );
 	while (from <= to) {
 
-		fprintf(stderr, "%d ", ptr[ from ] );
+		fprintf(stderr, "%ld ", ptr[ from ] );
 		from++;
 		if (nprinted++ >= 7) {
 			nprinted = 0;
@@ -63,14 +63,14 @@ void gsm_debug_longword P2(  (name, valu
 	char		* name,
 	longword	  value	)
 {
-	fprintf(stderr, "%s: %d\n", name, (long)value );
+	fprintf(stderr, "%s: %ld\n", name, (long)value );
 }
 
 void gsm_debug_word P2(  (name, value),
 	char	* name,
 	word	  value	)
 {
-	fprintf(stderr, "%s: %d\n", name, (long)value);
+	fprintf(stderr, "%s: %ld\n", name, (long)value);
 }
 
 #endif
--- a/src/toast.c
+++ b/src/toast.c
@@ -251,8 +251,8 @@ static char * emalloc P1((len), size_t l
 {
 	char * s;
 	if (!(s = malloc(len))) {
-		fprintf(stderr, "%s: failed to malloc %d bytes -- abort\n",
-			progname, len);
+		fprintf(stderr, "%s: failed to malloc %ld bytes -- abort\n",
+			progname, (long) len);
 		onintr();
 		exit(1);
 	}
@@ -270,7 +270,7 @@ static char* normalname P3((name, want, 
 	maxlen = strlen(name) + 1 + strlen(want) + strlen(cut);
 	p = strcpy(emalloc(maxlen), name);
 
-	if (s = suffix(p, cut)) strcpy(s, want);
+	if ((s = suffix(p, cut))) strcpy(s, want);
 	else if (*want && !suffix(p, want)) strcat(p, want);
 
 	return p;
@@ -386,7 +386,7 @@ static void update_times P0()
 		ut[0] = instat.st_atime;
 		ut[1] = instat.st_mtime;
 
-		(void) utime(outname, ut);
+		(void) utime(outname, (struct utimbuf *)ut);
 
 #endif	/* UTIMBUF */
 	}
@@ -416,7 +416,7 @@ static int okay_as_input P3((name,f,st),
 	}
 	if (st->st_nlink > 1 && !f_cat && !f_precious) {
 		fprintf(stderr, 
-		      "%s: \"%s\" has %s other link%s -- unchanged.\n",
+		      "%s: \"%s\" has %d other link%s -- unchanged.\n",
 			progname,name,st->st_nlink - 1,"s" + (st->st_nlink<=2));
 		return 0;
 	}
@@ -585,8 +585,8 @@ static int process_decode P0()
 
 		if (cc != sizeof(s)) {
 			if (cc >= 0) fprintf(stderr,
-			"%s: incomplete frame (%d byte%s missing) from %s\n",
-					progname, sizeof(s) - cc,
+			"%s: incomplete frame (%ld byte%s missing) from %s\n",
+					progname, (long) sizeof(s) - cc,
 					"s" + (sizeof(s) - cc == 1),
 					inname ? inname : "stdin" );
 			gsm_destroy(r);
@@ -624,8 +624,6 @@ static int process_decode P0()
 
 static int process P1((name), char * name)
 {
-	int step = 0;
-
 	out     = (FILE *)0;
 	in      = (FILE *)0;
 
@@ -779,7 +777,6 @@ int main P2((ac, av), int ac, char **av)
 	case 'h': help();    exit(0);
 
 	default: 
-	usage:
 		fprintf(stderr,
 	"Usage: %s [-fcpdhvuaslFC] [files...] (-h for help)\n",
 			progname);