Install Rserve return an error

I am trying to install Rserve but it returns an error. > install.packages('Rserve') trying URL 'https://cran.rstudio.com/src/contrib/Rserve_1.7-3.tar.gz ' Content type 'application/x-gzip' length 407390 bytes (397 KB) ================================================== downloaded 397 KB During startup - Warning messages: 1: Setting LC_CTYPE failed, using "C" 2: Setting LC_TIME failed, using "C" 3: Setting LC_MESSAGES failed, using "C" 4: Setting LC_MONETARY failed, using "C" * installing *source* package 'Rserve' ... ** package 'Rserve' successfully unpacked and MD5 sums checked checking whether to compile the server... yes checking whether to compile the client... no checking for gcc... clang checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether clang accepts -g... yes checking for clang option to accept ISO C89... none needed checking how to run the C preprocessor... clang -E checking for grep that handles long lines and -e... /usr/bin/grep checking for egrep... /usr/bin/grep -E checking for ANSI C header files... rm: conftest.dSYM: is a directory rm: conftest.dSYM: is a directory yes checking for sys/wait.h that is POSIX.1 compatible... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for string.h... (cached) yes checking for memory.h... (cached) yes checking sys/time.h usability... yes checking sys/time.h presence... yes checking for sys/time.h... yes checking for unistd.h... (cached) yes checking for sys/stat.h... (cached) yes checking for sys/types.h... (cached) yes checking sys/socket.h usability... yes checking sys/socket.h presence... yes checking for sys/socket.h... yes checking sys/un.h usability... yes checking sys/un.h presence... yes checking for sys/un.h... yes checking netinet/in.h usability... yes checking netinet/in.h presence... yes checking for netinet/in.h... yes checking netinet/tcp.h usability... yes checking netinet/tcp.h presence... yes checking for netinet/tcp.h... yes checking for an ANSI C-conforming const... yes checking whether byte ordering is bigendian... no checking whether time.h and sys/time.h may both be included... yes checking for pid_t... yes checking vfork.h usability... no checking vfork.h presence... no checking for vfork.h... no checking for fork... yes checking for vfork... yes checking for working fork... yes checking for working vfork... (cached) yes checking return type of signal handlers... void checking for memset... yes checking for mkdir... yes checking for rmdir... yes checking for select... yes checking for socket... yes checking for srandomdev... yes checking for library containing crypt... none required checking crypt.h usability... no checking crypt.h presence... no checking for crypt.h... no checking for socklen_t... yes checking for connect... yes checking whether to enable IPv6... no checking for dlopen in -ldl... yes checking openssl/rsa.h usability... no checking openssl/rsa.h presence... no checking for openssl/rsa.h... no checking openssl/ssl.h usability... no checking openssl/ssl.h presence... no checking for openssl/ssl.h... no configure: creating ./config.status config.status: creating src/Makevars config.status: creating src/client/cxx/Makefile config.status: creating src/config.h ** libs clang -I/usr/local/Cellar/r/3.2.1_1/R.framework/Resources/include -DNDEBUG -DRSERVE_PKG -I. -Iinclude -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -fPIC -g -O2 -c RSserver.c -o RSserver.o clang -I/usr/local/Cellar/r/3.2.1_1/R.framework/Resources/include -DNDEBUG -DRSERVE_PKG -I. -Iinclude -I/usr/local/opt/gettext/include -I/usr/local/opt/readline/include -fPIC -g -O2 -c Rserv.c -o Rserv.o Rserv.c:2976:16: warning: comparison of unsigned expression I can not understand where is the problem. This is my R version : > version _ platform x86_64-apple-darwin14.4.0 arch x86_64 os darwin14.4.0 system x86_64, darwin14.4.0 status major 3 minor 2.1 year 2015 month 06 day 18 svn rev 68531 language R version.string R version 3.2.1 (2015-06-18) nickname World-Famous Astronaut > How can I solve?