build failed with using bcc for my c++ applications

hi, all

I have a c++ application using bcc, but have several errors:

Here is what I did (Ubuntu 16.04, bcc version 0.3.0-fd716dca):

(1) Build bcc from source, by following this [link](https://github.com/iovisor/bcc/blob/master/INSTALL.md#debian---source). After it is successfully installed, I can find the head file at here ` /usr/include/bcc/`

(2) For my c++ application, I include the head file as `#include `.

(3) Compile with g++, and get following errors:

```
In file included from /usr/include/bcc/BPF.h:25,
from bpf_trace.hpp:10:
/usr/include/bcc/BPFTable.h: In constructor ‘ebpf::BPFArrayTable::BPFArrayTable(const ebpf::TableDesc&)’:
/usr/include/bcc/BPFTable.h:127:22: error: ‘BPF_MAP_TYPE_PERCPU_ARRAY’ was not declared in this scope
desc.type != BPF_MAP_TYPE_PERCPU_ARRAY)
^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/bcc/BPFTable.h:127:22: note: suggested alternative: ‘BPF_MAP_TYPE_PROG_ARRAY’
desc.type != BPF_MAP_TYPE_PERCPU_ARRAY)
^~~~~~~~~~~~~~~~~~~~~~~~~
BPF_MAP_TYPE_PROG_ARRAY
/usr/include/bcc/BPFTable.h: In constructor ‘ebpf::BPFPercpuArrayTable::BPFPercpuArrayTable(const ebpf::TableDesc&)’:
/usr/include/bcc/BPFTable.h:168:22: error: ‘BPF_MAP_TYPE_PERCPU_ARRAY’ was not declared in this scope
if (desc.type != BPF_MAP_TYPE_PERCPU_ARRAY)
^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/bcc/BPFTable.h:168:22: note: suggested alternative: ‘BPF_MAP_TYPE_PROG_ARRAY’
if (desc.type != BPF_MAP_TYPE_PERCPU_ARRAY)
^~~~~~~~~~~~~~~~~~~~~~~~~
BPF_MAP_TYPE_PROG_ARRAY
/usr/include/bcc/BPFTable.h: In constructor ‘ebpf::BPFHashTable::BPFHashTable(const ebpf::TableDesc&)’:
/usr/include/bcc/BPFTable.h:199:22: error: ‘BPF_MAP_TYPE_PERCPU_HASH’ was not declared in this scope
desc.type != BPF_MAP_TYPE_PERCPU_HASH &&
^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/bcc/BPFTable.h:199:22: note: suggested alternative: ‘BPF_MAP_TYPE_HASH’
desc.type != BPF_MAP_TYPE_PERCPU_HASH &&
^~~~~~~~~~~~~~~~~~~~~~~~
BPF_MAP_TYPE_HASH
/usr/include/bcc/BPFTable.h:200:22: error: ‘BPF_MAP_TYPE_LRU_HASH’ was not declared in this scope
desc.type != BPF_MAP_TYPE_LRU_HASH &&
^~~~~~~~~~~~~~~~~~~~~
/usr/include/bcc/BPFTable.h:200:22: note: suggested alternative: ‘BPF_MAP_TYPE_HASH’
desc.type != BPF_MAP_TYPE_LRU_HASH &&
^~~~~~~~~~~~~~~~~~~~~
BPF_MAP_TYPE_HASH
/usr/include/bcc/BPFTable.h:201:22: error: ‘BPF_MAP_TYPE_LRU_PERCPU_HASH’ was not declared in this scope
desc.type != BPF_MAP_TYPE_LRU_PERCPU_HASH)
```

I think the error comes from here:

```
auto table=
bpf->get_hash_table("lat").get_table_offline();
```

(4) I also used the same way to compile the c++ example in the example folder (one line change to the source code, `#include -> #include`) and got the same error .

Any ideas ?? Appreciate for the help.

The second question, Do I need to link to bcc, though currently, it is just compiling error ?

Reproduce the build on Ubuntu 16.04 with bcc version 0.3.0-fd716dca, following the Debian source steps in INSTALL.md. Inspect the installed /usr/include/bcc/BPF.h and BPFTable.h and compare them with the C++ example that was modified to include bcc/BPF.h; done means determining the cause of the missing map constants and the required build or linking setup.

Written by the indexing model from the issue text.