Checking if your kit is complete... Looks good Writing Makefile for Crypt::Square cp Square.pm blib/lib/Crypt/Square.pm /export/home/cpanrun/build/5.6.1/bin/perl -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi -I/export/home/cpanrun/build/5.6.1/lib/5.6.1 /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp -typemap /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap -typemap typemap Square.xs > Square.xsc && mv Square.xsc Square.c gcc -c -I. -DUSE_REENTRANT_API -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O -DVERSION=\"1.0.0\" -DXS_VERSION=\"1.0.0\" -fPIC -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi/CORE Square.c In file included from Square.xs:5: _square.c:1474: #error "Either LITTLE_ENDIAN or BIG_ENDIAN must be defined" make: *** [Square.o] Error 1