i have run into such problem before, now i have found how to avoid such things partly. This time I install GD mudule through the following orders: [root]#tar -xzvf GD-2.34.tar.gz [root]#cd GD-2.34 [root]#perl Makefile.PL [root]#make [root]#make test [root]#make install Pay attention, if you don't want to encounter the previous problem, you should NOT choose "Build support for animated GIFs" option, just as the following. [root]# perl Makefile.PL NOTICE: This module requires libgd 2.0.28 or higher. If you are using Math::Trig 1.01 or lower, it has a bug that causes a "prerequisite not found" warning to be issued. You may safely ignore this warning. Type perl Makefile.PL -h for command-line option summary Where is libgd installed? [/usr/lib] Please choose the features that match how libgd was built: Build JPEG support? [y]y Build PNG support? [y]y Build FreeType support? [y]y Build GIF support? [y]y Build support for animated GIFs? [y] n Build XPM support? [y]y If you experience compile problems, please check the @INC, @LIBPATH and @LIBS arrays defined in Makefile.PL and manually adjust, if necessary. Writing Makefile for GD [root]#