make  all-recursive
make[1]: Entering directory '/home/user/gnunet-ext'
Making all in src
make[2]: Entering directory '/home/user/gnunet-ext/src'
Making all in include
make[3]: Entering directory '/home/user/gnunet-ext/src/include'
Making all in .
make[4]: Entering directory '/home/user/gnunet-ext/src/include'
make[4]: Nothing to be done for 'all-am'.
make[4]: Leaving directory '/home/user/gnunet-ext/src/include'
make[3]: Leaving directory '/home/user/gnunet-ext/src/include'
Making all in ext
make[3]: Entering directory '/home/user/gnunet-ext/src/ext'
Making all in .
make[4]: Entering directory '/home/user/gnunet-ext/src/ext'
/bin/sh ../../libtool  --tag=CC   --mode=link gcc  -fno-strict-aliasing -Wall -g -O2 -L/usr/lib   -export-dynamic  -o gnunet-service-ext gnunet-service-ext.o -lgnunetutil -lgnunetcore -lgnunetdht  
libtool: link: gcc -fno-strict-aliasing -Wall -g -O2 -o gnunet-service-ext gnunet-service-ext.o -Wl,--export-dynamic  -L/usr/lib -lgnunetutil -lgnunetcore -lgnunetdht
/usr/bin/ld: gnunet-service-ext.o: in function `client_disconnect_cb':
/home/user/gnunet-ext/src/ext/gnunet-service-ext.c:189: undefined reference to `_'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:850: gnunet-service-ext] Error 1
make[4]: Leaving directory '/home/user/gnunet-ext/src/ext'
make[3]: *** [Makefile:928: all-recursive] Error 1
make[3]: Leaving directory '/home/user/gnunet-ext/src/ext'
make[2]: *** [Makefile:378: all-recursive] Error 1
make[2]: Leaving directory '/home/user/gnunet-ext/src'
make[1]: *** [Makefile:429: all-recursive] Error 1
make[1]: Leaving directory '/home/user/gnunet-ext'
make: *** [Makefile:361: all] Error 2