Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -llgrp
Writing Makefile for Solaris::Lgrp
cp Lgrp.pm blib/lib/Solaris/Lgrp.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 -typemap typemap Lgrp.xs > Lgrp.xsc && mv Lgrp.xsc Lgrp.c
gcc -c  -DUSE_REENTRANT_API -D_GNU_SOURCE -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"0.1.4\" -DXS_VERSION=\"0.1.4\" -fpic -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi/CORE  Lgrp.c
Lgrp.xs:34: sys/lgrp_user.h: No such file or directory
make: *** [Lgrp.o] Error 1