Respect libdir rather than always using 'lib'.
--- a/configure.in
+++ b/configure.in
@@ -127,13 +127,13 @@ AC_ARG_WITH(db,
     if test -f ${dir}/include/db_185.h; then
        AC_DEFINE(HAVE_DB_185_H)
        DBINC="-I${dir}/include"
-       DBLIB="-L${dir}/lib -ldb"
+       DBLIB="-L${dir}/${libdir#${prefix}} -ldb"
        have_db=yes
        break
     elif test -f ${dir}/include/db.h; then
        AC_DEFINE(HAVE_DB_H)
        DBINC="-I${dir}/include"
-       DBLIB="-L${dir}/lib -ldb"
+       DBLIB="-L${dir}/${libdir#${prefix}} -ldb"
        have_db=yes
        break
     fi
@@ -178,11 +178,11 @@ AC_ARG_WITH(libpcap,
 	PCAPLIB="-L$withval -lpcap"
      elif test -f $withval/include/pcap.h -a \
 	       -f $withval/include/net/bpf.h -a \
-	       -f $withval/lib/libpcap.a; then
+	       -f $withval/${libdir#${prefix}}/libpcap.a; then
 	owd=`pwd`
 	if cd $withval; then withval=`pwd`; cd $owd; fi
 	PCAPINC="-I$withval/include"
-	PCAPLIB="-L$withval/lib -lpcap"
+	PCAPLIB="-L$withval/${libdir#${prefix}} -lpcap"
      else
         AC_ERROR(pcap.h, net/bpf.h, or libpcap.a not found in $withval)
      fi
@@ -190,7 +190,7 @@ AC_ARG_WITH(libpcap,
   esac ],
 [ if test -f ${prefix}/include/pcap.h; then
      PCAPINC="-I${prefix}/include"
-     PCAPLIB="-L${prefix}/lib -lpcap"
+     PCAPLIB="-L${prefix}/${libdir#${prefix}} -lpcap"
   elif test -f /usr/include/pcap/pcap.h; then
      PCAPINC="-I/usr/include/pcap"
      PCAPLIB="-lpcap"
@@ -226,7 +226,7 @@ AC_ARG_WITH(libnet,
 	   CFLAGS="$CFLAGS `libnet-config --defines`"
 	fi
 	LNETINC="-I$withval/include"
-	LNETLIB="-L$withval/lib -lnet"
+	LNETLIB="-L$withval/${libdir#${prefix}} -lnet"
      else
         AC_ERROR(libnet.h or libnet.a not found in $withval)
      fi
@@ -235,7 +235,7 @@ AC_ARG_WITH(libnet,
 [ if test -f ${prefix}/include/libnet.h; then
      CFLAGS="$CFLAGS `${prefix}/bin/libnet-config --defines`"
      LNETINC="-I${prefix}/include"
-     LNETLIB="-L${prefix}/lib -lnet"
+     LNETLIB="-L${prefix}/${libdir#${prefix}} -lnet"
   elif test -f /usr/include/libnet.h; then
      CFLAGS="$CFLAGS `libnet-config --defines`"
      LNETLIB="-lnet"
@@ -267,7 +267,7 @@ AC_ARG_WITH(libnids,
 	owd=`pwd`
 	if cd $withval; then withval=`pwd`; cd $owd; fi
 	NIDSINC="-I$withval/include"
-	NIDSLIB="-L$withval/lib -lnids"
+	NIDSLIB="-L$withval/${libdir#${prefix}} -lnids"
      else
         AC_ERROR(nids.h or libnids.a not found in $withval)
      fi
@@ -275,7 +275,7 @@ AC_ARG_WITH(libnids,
   esac ],
 [ if test -f ${prefix}/include/nids.h; then
      NIDSINC="-I${prefix}/include"
-     NIDSLIB="-L${prefix}/lib -lnids"
+     NIDSLIB="-L${prefix}/${libdir#${prefix}} -lnids"
   elif test -f /usr/include/nids.h; then
      NIDSLIB="-lnids"
   else
@@ -309,11 +309,11 @@ AC_ARG_WITH(openssl,
 	SSLINC="-I$withval/include"
 	SSLLIB="-L$withval -lssl -lcrypto"
      elif test -f $withval/include/openssl/ssl.h -a \
-	       -f $withval/lib/libssl.a; then
+	       -f $withval/${libdir#${prefix}}/libssl.a; then
 	owd=`pwd`
 	if cd $withval; then withval=`pwd`; cd $owd; fi
 	SSLINC="-I$withval/include"
-	SSLLIB="-L$withval/lib -lssl -lcrypto"
+	SSLLIB="-L$withval/${libdir#${prefix}} -lssl -lcrypto"
      else
         AC_ERROR(ssl.h or libssl.a not found in $withval)
      fi
@@ -322,10 +322,10 @@ AC_ARG_WITH(openssl,
   esac ],
 [ if test -f ${prefix}/include/openssl/ssl.h; then
      SSLINC="-I${prefix}/include"
-     SSLLIB="-L${prefix}/lib -lssl -lcrypto"
+     SSLLIB="-L${prefix}/${libdir#${prefix}} -lssl -lcrypto"
   elif test -f ${prefix}/ssl/include/openssl/ssl.h; then
      SSLINC="-I${prefix}/ssl/include"
-     SSLLIB="-L${prefix}/ssl/lib -lssl -lcrypto"
+     SSLLIB="-L${prefix}/ssl/${libdir#${prefix}} -lssl -lcrypto"
   elif test -f /usr/include/openssl/ssl.h; then
      SSLLIB="-lssl -lcrypto"
   else