Checking if your kit is complete...
Looks good
Writing Makefile for Crypt::OpenSSL::Bignum
cp Bignum.pm blib/lib/Crypt/OpenSSL/Bignum.pm
cp Bignum/CTX.pm blib/lib/Crypt/OpenSSL/Bignum/CTX.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 Bignum.xs > Bignum.xsc && mv Bignum.xsc Bignum.c
gcc -c  -DUSE_REENTRANT_API -D_GNU_SOURCE -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"0.04\" -DXS_VERSION=\"0.04\" -fpic -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi/CORE -DPERL5 -DOPENSSL_NO_KRB5 Bignum.c
Bignum.xs:5: openssl/ssl.h: No such file or directory
Bignum.xs:6: openssl/bn.h: No such file or directory
make: *** [Bignum.o] Error 1