Configuring Async::Callback Pthreads detected, adding mutex support Enter path to install Callback.h in: [] Will install Callback.h in /Callback.h WARNING: H takes a array reference not a string/number. Please inform the author. Checking if your kit is complete... Looks good Checking if your kit is complete... Looks good Writing Makefile for Async::Callback::Test Can't use string ("Callback.h") as an ARRAY ref while "strict refs" in use at /home/cpanrun/pa-risc1.1/build/5.8.2/lib/5.8.2/ExtUtils/MM_Unix.pm line 503.