$NetBSD: patch-configure,v 1.9 2017/05/08 09:18:31 sborrill Exp $

Detect Berkeley DB.
Link against librt on NetBSD, too.
Link-test for shm_* functions.

--- configure.orig	2016-09-21 12:09:36.000000000 +0000
+++ configure	2017-04-24 14:23:58.000000000 +0000
@@ -13210,12 +13210,11 @@
      OLDCFLAGS=$CFLAGS
      OLDLDFLAGS=$LDFLAGS
      OLDLIBS=$LIBS
-     LIBS="-ldb $OLDLIBS"
-     for DBVER in 54 53 52 51 50 49 48 47 46 45 44 43 42; do
+     for DBVER in 4 5 6; do
         if test -d $libdbpath/include/db$DBVER; then
            echo -n "checking for Berleley DB under $libdbpath/include/db$DBVER and $libdbpath/lib/db$DBVER... "
            CFLAGS="-I$libdbpath/include/db$DBVER $OLDCFLAGS"
-           LDFLAGS="-L$libdbpath/lib/db$DBVER $OLDLDFLAGS"
+           LDFLAGS="-L$libdbpath/lib -ldb$DBVER $OLDLDFLAGS"
            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -13229,7 +13228,7 @@
 
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  echo yes;BDB_ADD_LDADD="-L$libdbpath/lib/db$DBVER -ldb"; BDB_ADD_FLAG="-I$libdbpath/include/db$DBVER";libdb="yes";
+  echo yes;BDB_ADD_LDADD="-L$libdbpath/lib -ldb$DBVER"; BDB_ADD_FLAG="-I$libdbpath/include/db$DBVER";libdb="yes";
 else
   libdb="no"; echo "no";
 
@@ -14546,6 +14545,11 @@
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking if posix shared mem works" >&5
 $as_echo_n "checking if posix shared mem works... " >&6; }
+case "$target_os" in
+linux*|netbsd*)
+	LIBS="-lrt  $LIBS"
+	;;
+esac
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -14566,7 +14570,7 @@
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
+if ac_fn_c_try_link "$LINENO"; then :
 
 $as_echo "#define HAVE_POSIX_SHARED_MEM 1" >>confdefs.h
 
@@ -14585,7 +14589,7 @@
 # Linux and solaris define the shm_open in -rt library.
 # This library already included in LIBS for solaris
 case "$target_os" in
-     linux*)
+     linux*|netbsd*)
         EXTRALIBS="$EXTRALIBS -lrt"
      ;;
      *)
