Extra flags needed for build

[drewhemm]

I had to add a couple of extra flags to the build in order to get it to work:

$ c++ -I . -o hdrdmacp *.cc -libverbs -lz -pthread

The -I . was needed to explicitly set the working directory as the include path, otherwise I would get this error:

$ c++ -o hdrdmacp *.cc -libverbs -lz
hdRDMA.cc:2:10: fatal error: hdRDMA.h: No such file or directory
 #include <hdRDMA.h>
          ^~~~~~~~~~
compilation terminated.
hdrdmacp.cc:5:10: fatal error: hdRDMA.h: No such file or directory
 #include <hdRDMA.h>
          ^~~~~~~~~~
compilation terminated.
In file included from hdRDMAThread.cc:12:
hdRDMA.h:19:10: fatal error: hdRDMAThread.h: No such file or directory
 #include <hdRDMAThread.h>
          ^~~~~~~~~~~~~~

And the -pthread was needed for cross-platform building I believe:

c++ -I . -o hdrdmacp *.cc -libverbs -lz
/usr/bin/ld: /tmp/ccH1rQ0c.o: undefined reference to symbol 'pthread_create@@GLIBC_2.2.5'
/usr/bin/ld: //lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

With those two additions, I was able to build successfully.