Hi all,
Im trying to compile the amcl node to run the navigation stack. However, i
get the following error:

amcl_node.cpp:(.text+0x2ee2): undefined reference to `pf_get_cluster_stats'
  amcl_node.cpp:(.text+0x3f65): undefined reference to `pf_update_resample'
  CMakeFiles/amcl_node.dir/src/amcl_node.o: In function
`AmclNode::~AmclNode()':
  amcl_node.cpp:(.text+0x7086): undefined reference to `map_free'
  amcl_node.cpp:(.text+0x7195): undefined reference to `pf_free'
  CMakeFiles/amcl_node.dir/src/amcl_node.o: In function
`AmclNode::~AmclNode()':
  amcl_node.cpp:(.text+0x7676): undefined reference to `map_free'
  amcl_node.cpp:(.text+0x7785): undefined reference to `pf_free'
  CMakeFiles/amcl_node.dir/src/amcl_node.o: In function
`AmclNode::requestMap()':
  amcl_node.cpp:(.text+0x7d1d): undefined reference to `map_alloc'
  CMakeFiles/amcl_node.dir/src/amcl_node.o: In function
`AmclNode::AmclNode()':
  amcl_node.cpp:(.text+0x9b0c): undefined reference to `pf_alloc'
  amcl_node.cpp:(.text+0x9b3b): undefined reference to `pf_vector_zero'
  amcl_node.cpp:(.text+0x9b70): undefined reference to `pf_matrix_zero'
  amcl_node.cpp:(.text+0x9d88): undefined reference to `pf_init'
  amcl_node.cpp:(.text+0x9da8): undefined reference to
`amcl::AMCLOdom::AMCLOdom()'
  amcl_node.cpp:(.text+0x9dea): undefined reference to
`amcl::AMCLOdom::SetModelDiff(double, double, double, double)'
  amcl_node.cpp:(.text+0x9e17): undefined reference to
`amcl::AMCLLaser::AMCLLaser(unsigned int, map_t*)'
  amcl_node.cpp:(.text+0x9e82): undefined reference to
`amcl::AMCLLaser::SetModelBeam(double, double, double, double, double,
double, double)'
  amcl_node.cpp:(.text+0xaa91): undefined reference to
`amcl::AMCLLaser::SetModelLikelihoodField(double, double, double, double)'
  amcl_node.cpp:(.text+0xb118): undefined reference to
`amcl::AMCLOdom::SetModelOmni(double, double, double, double, double)'
  CMakeFiles/amcl_node.dir/src/amcl_node.o: In function
`AmclNode::AmclNode()':
  amcl_node.cpp:(.text+0xd7ad): undefined reference to `pf_alloc'
  amcl_node.cpp:(.text+0xd7dc): undefined reference to `pf_vector_zero'
  amcl_node.cpp:(.text+0xd811): undefined reference to `pf_matrix_zero'
  amcl_node.cpp:(.text+0xda29): undefined reference to `pf_init'
  amcl_node.cpp:(.text+0xda49): undefined reference to
`amcl::AMCLOdom::AMCLOdom()'
  amcl_node.cpp:(.text+0xda8b): undefined reference to
`amcl::AMCLOdom::SetModelDiff(double, double, double, double)'
  amcl_node.cpp:(.text+0xdab8): undefined reference to
`amcl::AMCLLaser::AMCLLaser(unsigned int, map_t*)'
  amcl_node.cpp:(.text+0xdb23): undefined reference to
`amcl::AMCLLaser::SetModelBeam(double, double, double, double, double,
double, double)'
  amcl_node.cpp:(.text+0xe811): undefined reference to
`amcl::AMCLLaser::SetModelLikelihoodField(double, double, double, double)'
  amcl_node.cpp:(.text+0xee98): undefined reference to
`amcl::AMCLOdom::SetModelOmni(double, double, double, double, double)'
  collect2: ld returned 1 exit status
  make[3]: *** [../amcl_node] Error 1


I get these despite the fact that pf.h is included in the headers...
Any suggestions would be helpful!
-- 
Regards,
Hitesh Dhiman
Electrical Engineering
National University of Singapore