Debian-specific modifications to the upstream Makefile.in to
build a shared library.

--- a/Makefile.in
+++ b/Makefile.in
@@ -38,6 +38,13 @@ mandir = @mandir@
 srcdir = @srcdir@
 VPATH = @srcdir@
 
+# some defines for shared library compilation
+LIBVERSION=1
+LIBNAME=pcap
+LIBRARY=lib$(LIBNAME).a
+SOLIBRARY=lib$(LIBNAME).so
+SHAREDLIB=$(SOLIBRARY).$(LIBVERSION)
+
 #
 # You shouldn't need to edit anything below.
 #
@@ -62,7 +69,8 @@ DEPENDENCY_CFLAG = @DEPENDENCY_CFLAG@
 PROG=libpcap
 
 # Standard CFLAGS
-FULL_CFLAGS = $(CCOPT) $(INCLS) $(DEFS) $(CFLAGS)
+FULL_CFLAGS = $(CCOPT) $(INCLS) $(DEFS) $(CFLAGS) $(CPPFLAGS)
+CFLAGS_SHARED = -shared -Wl,-soname,$(SHAREDLIB)
 
 INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
@@ -77,7 +85,11 @@ YACC = @YACC@
 # problem if you don't own the file but can write to the directory.
 .c.o:
 	@rm -f $@
-	$(CC) $(FULL_CFLAGS) -c $(srcdir)/$*.c
+	$(CC) $(FULL_CFLAGS) -c -o $@ $(srcdir)/$*.c
+
+%_pic.o: %.c %.o
+	@rm -f $@
+	$(CC) -fPIC $(FULL_CFLAGS) -c -o $@ $(srcdir)/$*.c
 
 PSRC =	pcap-@V_PCAP@.c @USB_SRC@ @BT_SRC@ @BT_MONITOR_SRC@ @NETFILTER_SRC@ @DBUS_SRC@
 FSRC =  @V_FINDALLDEVS@
@@ -93,6 +105,7 @@ SRC =	$(PSRC) $(FSRC) $(CSRC) $(SSRC) $(
 # We would like to say "OBJ = $(SRC:.c=.o)" but Ultrix's make cannot
 # hack the extra indirection
 OBJ =	$(PSRC:.c=.o) $(FSRC:.c=.o) $(CSRC:.c=.o) $(SSRC:.c=.o) $(GENSRC:.c=.o) $(LIBOBJS)
+OBJ_PIC = $(PSRC:.c=_pic.o) $(FSRC:.c=_pic.o) $(CSRC:.c=_pic.o) $(SSRC:.c=_pic.o) $(GENSRC:.c=_pic.o)
 PUBHDR = \
 	pcap.h \
 	pcap-bpf.h \
@@ -157,7 +170,7 @@ TAGFILES = \
 
 CLEANFILES = $(OBJ) libpcap.* $(TESTS) \
 	$(PROG)-`cat $(srcdir)/VERSION`.tar.gz $(GENSRC) $(GENHDR) \
-	lex.yy.c pcap-config
+	lex.yy.c pcap-config $(OBJ_PIC)
 
 MAN1 = pcap-config.1
 
@@ -365,7 +378,7 @@ libpcap.a: $(OBJ)
 	$(AR) rc $@ $(OBJ) $(ADDLARCHIVEOBJS)
 	$(RANLIB) $@
 
-shared: libpcap.$(DYEXT)
+shared: $(SHAREDLIB)
 
 libpcap.so: $(OBJ)
 	@rm -f $@
@@ -443,6 +456,12 @@ libpcap.shareda: $(OBJ)
 #
 libpcap.none:
 
+$(SHAREDLIB): $(OBJ_PIC)
+	-@rm -f $@
+	-@rm -f $(SOLIBRARY)
+	$(CC) $(CFLAGS_SHARED) $(LDFLAGS) -o $(SHAREDLIB) $(OBJ_PIC) -lc $(LIBS)
+	ln -s $(SHAREDLIB) $(SOLIBRARY)
+
 scanner.c: $(srcdir)/scanner.l
 	$(LEX) -P pcap_ --header-file=scanner.h --nounput -o scanner.c $<
 scanner.h: scanner.c
@@ -455,6 +474,9 @@ scanner.h: scanner.c
 scanner.o: scanner.c grammar.h
 	$(CC) $(FULL_CFLAGS) -c scanner.c
 
+scanner_pic.o: scanner.c grammar.h
+	$(CC) -fPIC $(FULL_CFLAGS) -o $@ -c scanner.c
+
 pcap.o: pcap_version.h
 
 grammar.c: $(srcdir)/grammar.y
@@ -472,9 +494,16 @@ grammar.o: grammar.c
 gencode.o: $(srcdir)/gencode.c grammar.h scanner.h
 	$(CC) $(FULL_CFLAGS) -c $(srcdir)/gencode.c
 
+grammar_pic.o: grammar.c
+	@rm -f $@
+	$(CC) -fPIC $(FULL_CFLAGS) -Dyylval=pcap_lval -o $@ -c grammar.c
+
 version.o: version.c
 	$(CC) $(FULL_CFLAGS) -c version.c
 
+version_pic.o: version.c
+	$(CC) -fPIC $(FULL_CFLAGS) -c version.c -o $@
+
 snprintf.o: $(srcdir)/missing/snprintf.c
 	$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/snprintf.c
 
@@ -501,6 +530,9 @@ bpf_filter.c: $(srcdir)/bpf/net/bpf_filt
 bpf_filter.o: bpf_filter.c
 	$(CC) $(FULL_CFLAGS) -c bpf_filter.c
 
+bpf_filter_pic.o: bpf_filter.c
+	$(CC) -fPIC $(FULL_CFLAGS) -c bpf_filter.c -o $@
+
 #
 # Generate the pcap-config script.
 #
@@ -623,14 +655,11 @@ install: install-shared install-archive
 		    $(DESTDIR)$(mandir)/man@MAN_MISC_INFO@/`echo $$i | sed 's/.manmisc.in/.@MAN_MISC_INFO@/'`; done
 
 install-shared: install-shared-$(DYEXT)
-install-shared-so: libpcap.so
+install-shared-so: $(SHAREDLIB)
 	[ -d $(DESTDIR)$(libdir) ] || \
 	    (mkdir -p $(DESTDIR)$(libdir); chmod 755 $(DESTDIR)$(libdir))
-	VER=`cat $(srcdir)/VERSION`; \
-	MAJOR_VER=`sed 's/\([0-9][0-9]*\)\..*/\1/' $(srcdir)/VERSION`; \
-	$(INSTALL_PROGRAM) libpcap.so.$$VER $(DESTDIR)$(libdir)/libpcap.so.$$VER; \
-	ln -sf libpcap.so.$$VER $(DESTDIR)$(libdir)/libpcap.so.$$MAJOR_VER; \
-	ln -sf libpcap.so.$$MAJOR_VER $(DESTDIR)$(libdir)/libpcap.so
+	$(INSTALL_DATA) $(SHAREDLIB) $(DESTDIR)$(libdir)/
+	ln -sf $(SHAREDLIB) $(DESTDIR)$(libdir)/$(SOLIBRARY)
 install-shared-dylib: libpcap.dylib
 	[ -d $(DESTDIR)$(libdir) ] || \
 	    (mkdir -p $(DESTDIR)$(libdir); chmod 755 $(DESTDIR)$(libdir))
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -470,7 +470,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
 			esac
 			;;
 		    esac
-		    V_CCOPT="$V_CCOPT $PIC_OPT"
+		    V_CCOPT="$V_CCOPT"
 		    V_SONAME_OPT="-Wl,-soname,"
 		    V_RPATH_OPT="-Wl,-rpath,"
 		    ;;
@@ -533,7 +533,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
 		    #
 		    # "cc" is GCC.
 		    #
-		    V_CCOPT="$V_CCOPT -fpic"
+		    V_CCOPT="$V_CCOPT"
 		    V_SHLIB_CMD="\$(CC)"
 		    V_SHLIB_OPT="-shared"
 		    V_SONAME_OPT="-Wl,-soname,"
--- a/pcap-config.in
+++ b/pcap-config.in
@@ -36,16 +36,6 @@ do
 	esac
 	shift
 done
-if [ "$V_RPATH_OPT" != "" ]
-then
-	#
-	# If libdir isn't /usr/lib, add it to the run-time linker path.
-	#
-	if [ "$libdir" != "/usr/lib" ]
-	then
-		RPATH=$V_RPATH_OPT$libdir
-	fi
-fi
 if [ "$static" = 1 ]
 then
 	#
