Configuring Async::Callback

No supported threading library found (mutex support disabled)

Enter path to install Callback.h in: [/usr/local/include] 
Will install Callback.h in /usr/local/include/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 C:/cpanrun/build/5-10-0/lib/ExtUtils/MM_Unix.pm line 439.