Checking if your kit is complete... Looks good Note (probably harmless): No library found for -ldoublefann Writing Makefile for AI::FANN cp lib/AI/FANN.pm blib/lib/AI/FANN.pm /export/home/cpanrun/build/5.8.0/bin/perl /export/home/cpanrun/build/5.8.0/lib/5.8.0/ExtUtils/xsubpp -typemap /export/home/cpanrun/build/5.8.0/lib/5.8.0/ExtUtils/typemap -typemap typemap FANN.xs > FANN.xsc && mv FANN.xsc FANN.c gcc -c -I. -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O -DVERSION=\"0.08\" -DXS_VERSION=\"0.08\" -fPIC "-I/export/home/cpanrun/build/5.8.0/lib/5.8.0/sun4-solaris-thread-multi/CORE" FANN.c FANN.xs:11: doublefann.h: No such file or directory In file included from FANN.xs:12: morefann.h:2: doublefann.h: No such file or directory make: *** [FANN.o] Error 1