!g
gcc *.c -ljpeg -lpng -lminigui -lpthread
/usr/local/lib/libminigui.so: undefined reference to `dlsym'
/usr/local/lib/libminigui.so: undefined reference to `dlerror'
/usr/local/lib/libminigui.so: undefined reference to `dlopen'
/usr/local/lib/libminigui.so: undefined reference to `dlclose'
collect2: ld 返回 1
man dlsym发现此函数在动态库/usr/lib/libdl.so里面
于是果断链接动态库试试看，却成功了
gcc *.c -ljpeg -lpng -lminigui -lpthread -ldl