Use a linker script.

--- a/Makefile.in
+++ b/Makefile.in
@@ -71,7 +71,7 @@
 
 # Standard CFLAGS
 FULL_CFLAGS = $(CCOPT) $(INCLS) $(DEFS) $(CFLAGS) $(CPPFLAGS)
-CFLAGS_SHARED = -shared -Wl,-soname,$(SOLIBRARY).$(MAJ)
+CFLAGS_SHARED = -shared -Wl,-soname,$(SOLIBRARY).$(MAJ) -Wl,--version-script=libpcap-symbols.lds
 
 INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
--- /dev/null
+++ b/libpcap-symbols.lds
@@ -0,0 +1,99 @@
+{
+  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;
+  local:
+    *;
+};