由于未定义符号，Meshlab崩溃

Question

在Ubuntu 16.04 LTS 64位上，当我应用“屏蔽的泊松曲面重建”插件时，Meshlab崩溃了。错误消息为：

meshlab: symbol lookup error: /home/eric/dev/3D/meshlab/meshlab/src/distrib/plugins/libfilter_screened_poisson.so: undefined symbol: omp_get_num_procs

此符号位于/usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0中：

$ objdump -T /usr/lib/x86_64-linux-gnu/libgomp.so.1.0.0|grep omp_get_num_procs
00000000000125c0 g    DF .text  0000000000000005  OMP_1.0     omp_get_num_procs_
0000000000011870 g    DF .text  0000000000000005  OMP_1.0     omp_get_num_procs

在生成meshlab之后，我从GNOME终端运行它。我的LD_LIBRARY_PATH (和LIBDIR)是：

echo $LD_LIBRARY_PATH
/usr/local/lib:/usr/lib

所以我在LIBDIR中添加了/usr/lib/x86_64-linux-gnu

echo $LD_LIBRARY_PATH
/usr/local/lib:/usr/lib:/usr/lib/x86_64-linux-gnu

但是现在，我有了这个错误：

$ ./meshlab
This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".    
Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.    
Reinstalling the application may fix this problem.

如何告诉插件在哪里可以找到合适的符号？