--- nsock/src/configure
+++ nsock/src/configure
@@ -594,6 +594,7 @@
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 NBASEDIR
+PCAPINCDIR
 LIBNBASE_LIBS
 OPENSSL_LIBS
 EGREP
@@ -659,7 +660,7 @@
 ac_user_opts='
 enable_option_checking
 with_localdirs
-with_pcap
+with_libpcap
 with_openssl
 with_libnbase
 '
@@ -2244,10 +2245,14 @@
 fi
 
 pcap_enabled=yes
+PCAPINCDIR="../../libpcap"
 
-# Check whether --with-pcap was given.
-if test "${with_pcap+set}" = set; then :
-  withval=$with_pcap;  pcap_enabled="$withval"
+# Check whether --with-libpcap was given.
+if test "${with_libpcap+set}" = set; then :
+  withval=$with_libpcap;  pcap_enabled="$withval"
+  if test "$with_libpcap" != "included"; then
+    PCAPINCDIR="$with_libpcap/include/pcap"
+  fi
 fi
 
 
--- nsock/src/Makefile.in
+++ nsock/src/Makefile.in
@@ -14,7 +14,7 @@
 DEFS = @DEFS@ -DNSOCK_VERSION=\"$(NSOCK_VERSION)\"
 # With GCC, add extra security checks to source code.
 DEFS += -D_FORTIFY_SOURCE=2
-INCLS = -I../include -I../../libpcap
+INCLS = -I../include -I@PCAPINCDIR@
 CFLAGS = @CFLAGS@ $(CCOPT)
 # CFLAGS = -g -Wall $(DEFS) $(INCLS)
 CPPFLAGS = @CPPFLAGS@ $(DEFS) $(INCLS)