As of January 2007, ICU version 3.6 could be compiled on PA-RISC HP-UX with the following configuration:
Operating System: UNIX
UNIX
Version: HP-UX 11.11
HP-UX 11.11
Compilers: aCC A.03.50, cc B.11.11.08, GNU make (3.77+)
aCC A.03.50, cc B.11.11.08, GNU make (3.77+)