gr_prefix.cc:28:10: warning: missing terminating " character
gr_prefix.cc:28: error: missing terminating " character
gr_prefix.cc:30:1: warning: missing terminating " character
gr_prefix.cc:30: error: missing terminating " character
gr_prefix.cc: In function ‘const std::string gr_prefix()’:
gr_prefix.cc:29: error: expected primary-_expression_ before ‘/’ token
gr_prefix.cc:29: error: ‘gr’ was not declared in this scope
gr_prefix.cc:31: error: expected ‘;’ before ‘}’ token
make[6]: *** [gr_prefix.lo] Error 1
make[6]: Leaving directory `/home/halilyigit2/hydra/gnuradio/gnuradio-core/src/lib/general'
make[5]: *** [all] Error 2
make[5]: Leaving directory `/home/halilyigit2/hydra/gnuradio/gnuradio-core/src/lib/general'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving
directory `/home/halilyigit2/hydra/gnuradio/gnuradio-core/src/lib'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/halilyigit2/hydra/gnuradio/gnuradio-core/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/halilyigit2/hydra/gnuradio/gnuradio-core'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/halilyigit2/hydra/gnuradio'
make: *** [all] Error 2
Could you help me to solve this error?