Checking if your kit is complete... Looks good Writing Makefile for Socket::MsgHdr cp MsgHdr.pm blib/lib/Socket/MsgHdr.pm /home/cpanrun/build/5.6.1/bin/perl -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi -I/home/cpanrun/build/5.6.1/lib/5.6.1 /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp -typemap /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap MsgHdr.xs > MsgHdr.xsc && mv MsgHdr.xsc MsgHdr.c gcc -c -I. -DUSE_REENTRANT_API -D_GNU_SOURCE -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" -fpic -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi/CORE MsgHdr.c MsgHdr.xs:21: field `io' has incomplete type make: *** [MsgHdr.o] Error 1