Hi, I modified the build scripts of tun/tap driver for Solaris and uploaded it to web site below.
http://www.whiteboard.ne.jp/~admin2/tuntap/ Now, it is capable .. to build 32bit module on 64bit environment by using --disable-64bit option to configure script. to checks if ld command is GNU ld or Solaris bundled ld. And then appends appropriate option for GNU ld. to specify target install directory using DESTDIR macro to make command. Thanks Victor, for the info and help. Kazuyoshi