Index: b/configure.ac
===================================================================
--- b/configure.ac
+++ b/configure.ac
@@ -129,6 +129,10 @@
     *-*-aix*)
 	have_fork_unsafe_semaphore=yes
         ;;
+    *-*-netbsd*)
+        LIBS="-lpthread $LIBS"
+        AC_SEARCH_LIBS([sem_init],[rt])
+        ;;
 esac
 
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
@@ -137,7 +141,7 @@
 fi
 
 # Set some default values
-config_libs="-lnpth"
+config_libs="-lnpth $LIBS"
 have_w32_system=no
 have_w32ce_system=no
 have_w64_system=no