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

--- a/Makefile.in
+++ b/Makefile.in
@@ -40,6 +40,14 @@ mandir = @mandir@
 srcdir = @srcdir@
 VPATH = @srcdir@
 
+# some defines for shared library compilation
+MAJ=0.8
+LIBVERSION=$(shell head -1 debian/changelog | perl -nle 'm/\S+\s+\((\S+)-\S+\)/ and print $$1')
+LIBNAME=pcap
+LIBRARY=lib$(LIBNAME).a
+SOLIBRARY=lib$(LIBNAME).so
+SHAREDLIB=$(SOLIBRARY).$(LIBVERSION)
+
 #
 # You shouldn't need to edit anything below.
 #
@@ -69,7 +77,8 @@ INSTALL_RPCAPD=@INSTALL_RPCAPD@
 EXTRA_NETWORK_LIBS=@EXTRA_NETWORK_LIBS@
 
 # Standard CFLAGS for building members of a shared library
-FULL_CFLAGS = $(CCOPT) @V_LIB_CCOPT_FAT@ $(SHLIB_CCOPT) $(INCLS) $(DEFS) $(CFLAGS)
+FULL_CFLAGS = $(CCOPT) @V_LIB_CCOPT_FAT@ $(SHLIB_CCOPT) $(INCLS) $(DEFS) $(CFLAGS) $(CPPFLAGS)
+CFLAGS_SHARED = -shared -Wl,-soname,$(SOLIBRARY).$(MAJ) -Wl,--version-script=libpcap-symbols.lds
 
 INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
@@ -84,7 +93,11 @@ 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
+	@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@ @NETMAP_SRC@ @RDMA_SRC@
 FSRC =  @V_FINDALLDEVS@
@@ -101,6 +114,7 @@ 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) $(LIBOBJS:.o=_pic.o)
 PUBHDR = \
 	pcap.h \
 	pcap-bpf.h \
@@ -155,7 +169,7 @@ TAGFILES = \
 
 CLEANFILES = $(OBJ) libpcap.a libpcap.so.`cat $(srcdir)/VERSION` \
 	$(PROG)-`cat $(srcdir)/VERSION`.tar.gz $(GENSRC) $(GENHDR) \
-	lex.yy.c pcap-config libpcap.pc
+	lex.yy.c pcap-config libpcap.pc $(OBJ_PIC)
 
 MAN1 = pcap-config.1
 
@@ -392,7 +406,7 @@ libpcap.a: $(OBJ)
 	$(AR) rc $@ $(OBJ) $(ADDLARCHIVEOBJS)
 	$(RANLIB) $@
 
-shared: libpcap.$(DYEXT)
+shared: $(SHAREDLIB)
 
 libpcap.so: $(OBJ)
 	@rm -f $@
@@ -468,6 +482,13 @@ libpcap.shareda: $(OBJ)
 #
 libpcap.none:
 
+$(SHAREDLIB): $(OBJ_PIC)
+	-@rm -f $@
+	-@rm -f $(SOLIBRARY) $(SOLIBRARY).$(MAJ)
+	$(CC) $(CFLAGS_SHARED) $(LDFLAGS) -o $(SHAREDLIB) $(OBJ_PIC) -lc $(LIBS)
+	ln -s $(SHAREDLIB) $(SOLIBRARY).$(MAJ)
+	ln -s $(SOLIBRARY).$(MAJ) $(SOLIBRARY)
+
 scanner.c: $(srcdir)/scanner.l
 	$(LEX) -P pcap_ --header-file=scanner.h --nounput -o scanner.c $<
 scanner.h: scanner.c
@@ -480,6 +501,9 @@ 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
+
 grammar.c: $(srcdir)/grammar.y
 	$(YACC) -p pcap_ -o grammar.c -d $<
 grammar.h: grammar.c
@@ -492,6 +516,10 @@ grammar.h: grammar.c
 grammar.o: grammar.c scanner.h
 	$(CC) $(FULL_CFLAGS) -c grammar.c
 
+grammar_pic.o: grammar.c
+	@rm -f $@
+	$(CC) -fPIC $(FULL_CFLAGS) -o $@ -c grammar.c
+
 gencode.o: $(srcdir)/gencode.c grammar.h scanner.h
 	$(CC) $(FULL_CFLAGS) -c $(srcdir)/gencode.c
 
@@ -504,9 +532,17 @@ snprintf.o: $(srcdir)/missing/snprintf.c
 strlcat.o: $(srcdir)/missing/strlcat.c
 	$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcat.c
 
+strlcat_pic.o: $(srcdir)/missing/strlcat.c
+	@rm -f $@
+	$(CC) -fPIC $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcat.c
+
 strlcpy.o: $(srcdir)/missing/strlcpy.c
 	$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcpy.c
 
+strlcpy_pic.o: $(srcdir)/missing/strlcpy.c
+	@rm -f $@
+	$(CC) -fPIC $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strlcpy.c
+
 strtok_r.o: $(srcdir)/missing/strtok_r.c
 	$(CC) $(FULL_CFLAGS) -o $@ -c $(srcdir)/missing/strtok_r.c
 
@@ -539,6 +575,9 @@ pcap-config: $(srcdir)/pcap-config.in ./
 	mv $@.tmp $@
 	chmod a+x $@
 
+bpf_filter_pic.o: bpf_filter.c
+	$(CC) -fPIC $(FULL_CFLAGS) -c bpf_filter.c -o $@
+
 #
 # Remote pcap daemon.
 #
@@ -635,11 +674,9 @@ install-shared: install-shared-$(DYEXT)
 install-shared-so: libpcap.so
 	[ -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)/$(SOLIBRARY).$(MAJ)
+	ln -sf $(SOLIBRARY).$(MAJ) $(DESTDIR)$(libdir)/$(SOLIBRARY)
 install-shared-dylib: libpcap.dylib
 	[ -d $(DESTDIR)$(libdir) ] || \
 	    (mkdir -p $(DESTDIR)$(libdir); chmod 755 $(DESTDIR)$(libdir))
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -507,7 +507,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
 			esac
 			;;
 		    esac
-		    V_SHLIB_CCOPT="$V_SHLIB_CCOPT $PIC_OPT"
+		    V_SHLIB_CCOPT="$V_SHLIB_CCOPT"
 		    V_SONAME_OPT="-Wl,-soname,"
 		    V_RPATH_OPT="-Wl,-rpath,"
 		    ;;
@@ -570,7 +570,7 @@ AC_DEFUN(AC_LBL_SHLIBS_INIT,
 		    #
 		    # "cc" is GCC.
 		    #
-		    V_SHLIB_CCOPT="$V_SHLIB_CCOPT -fpic"
+		    V_SHLIB_CCOPT="$V_SHLIB_CCOPT"
 		    V_SHLIB_CMD="\$(CC)"
 		    V_SHLIB_OPT="-shared"
 		    V_SONAME_OPT="-Wl,-soname,"
--- /dev/null
+++ b/libpcap-symbols.lds
@@ -0,0 +1,106 @@
+{
+  global:
+    bpf_dump;
+    bpf_filter;
+    bpf_image;
+    bpf_validate;
+    eproto_db;
+    pcap_breakloop;
+    pcap_can_set_rfmon;
+    pcap_close;
+    pcap_compile;
+    pcap_compile_nopcap;
+    pcap_datalink;
+    pcap_datalink_name_to_val;
+    pcap_datalink_val_to_description;
+    pcap_datalink_val_to_name;
+    pcap_dispatch;
+    pcap_dump;
+    pcap_dump_close;
+    pcap_dump_file;
+    pcap_dump_flush;
+    pcap_dump_fopen;
+    pcap_dump_ftell;
+    pcap_dump_open;
+    pcap_ether_aton;
+    pcap_ether_hostton;
+    pcap_file;
+    pcap_fileno;
+    pcap_findalldevs;
+    pcap_fopen_offline;
+    pcap_freealldevs;
+    pcap_freecode;
+    pcap_get_selectable_fd;
+    pcap_geterr;
+    pcap_getnonblock;
+    pcap_inject;
+    pcap_is_swapped;
+    pcap_lib_version;
+    pcap_list_datalinks;
+    pcap_lookupdev;
+    pcap_lookupnet;
+    pcap_loop;
+    pcap_major_version;
+    pcap_minor_version;
+    pcap_nametoaddr;
+    pcap_nametoaddrinfo;
+    pcap_nametoeproto;
+    pcap_nametollc;
+    pcap_nametonetaddr;
+    pcap_nametoport;
+    pcap_nametoportrange;
+    pcap_nametoproto;
+    pcap_next;
+    pcap_next_etherent;
+    pcap_next_ex;
+    pcap_open_dead;
+    pcap_open_live;
+    pcap_open_offline;
+    pcap_perror;
+    pcap_sendpacket;
+    pcap_set_datalink;
+    pcap_setdirection;
+    pcap_setfilter;
+    pcap_setnonblock;
+    pcap_snapshot;
+    pcap_stats;
+    pcap_statustostr;
+    pcap_strerror;
+    pcap_version;
+    /* introduced in pcap 1.0 */
+    pcap_activate;
+    pcap_create;
+    pcap_datalink_ext;
+    pcap_free_datalinks;
+    pcap_offline_filter;
+    pcap_set_buffer_size;
+    pcap_set_promisc;
+    pcap_set_rfmon;
+    pcap_set_snaplen;
+    pcap_set_timeout;
+    /* introduced in pcap 1.2 */
+    pcap_set_tstamp_type;
+    pcap_list_tstamp_types;
+    pcap_free_tstamp_types;
+    pcap_tstamp_type_name_to_val;
+    pcap_tstamp_type_val_to_name;
+    pcap_tstamp_type_val_to_description;
+    /* introduced in pcap 1.5 */
+    pcap_set_immediate_mode;
+    pcap_set_tstamp_precision;
+    pcap_get_tstamp_precision;
+    pcap_open_dead_with_tstamp_precision;
+    pcap_open_offline_with_tstamp_precision;
+    pcap_fopen_offline_with_tstamp_precision;
+    /* introduced in pcap 1.7 */
+    pcap_dump_open_append;
+    /* introduced in pcap 1.9.0 */
+    pcap_bufsize;
+    pcap_dump_ftell64;
+    pcap_get_required_select_timeout;
+    pcap_set_protocol_linux;	/* linux-only */
+    /* introduced in pcap 1.9.1 */
+    pcap_datalink_val_to_description_or_dlt;
+  local:
+    *;
+};