Looks like the job is already done... I read the following post on Firebird Development from Bill Oliver (SAS)
"I confirm that the issues are fixed in HEAD. I confirmed this on 64-bit
Solaris Sparc, built with the Sun Studio native compiler - using pthreads!!!
"How cool is that! Thanks very much guys for the quick turn-around.
Also, big thanks to Alex for his assitance with this port!!"