[Libguestfs] The usage if libguestfs

HI all: my problem is : I want to use libguestfs on other project. if I just run a test C programm It works well just run : cc prog.c -o prog -lguestfs -I /usr/libguestfs/libguestfs-1.28.10/src/ I write a C programm in my project , after that I run make , it happend: /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_launch' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_close' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_inspect_os' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_ls' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_inspect_get_type' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_inspect_get_mountpoints' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_inspect_get_major_version' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_inspect_get_product_name' /usr/nitro/libvmi-master/libvmi/.libs/libvmi.so: undefined reference to `guestfs_add_drive_opts' I think It's owe to the lack of DLL, so I did some change in Makefile, the change is : - LIBS = -lvirt -LDFLAGS = +LDFLAGS = /usr/lib +LIBS = -lguestfs -lvirt but it didn't works! so does anyone know what's the problem? appreciate so much