Checking if your kit is complete... Looks good Writing Makefile for Digest::Hashcash cp Hashcash.pm blib/lib/Digest/Hashcash.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 Hashcash.xs > Hashcash.xsc && mv Hashcash.xsc Hashcash.c gcc -c -DUSE_REENTRANT_API -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O -DVERSION=\"0.03\" -DXS_VERSION=\"0.03\" -fPIC -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi/CORE Hashcash.c Hashcash.xs:7: stdint.h: No such file or directory make: *** [Hashcash.o] Error 1