As of December 2009, ICU version 4.2 could be compiled on AIX with the following configuration:
Operating System: AIX
AIX
Version: AIX 5.3 (PowerPC 64-bit)
AIX 5.3 (PowerPC 64-bit)
Compilers: VisualAge 6, GNU make (3.77+), ANSI C compiler
VisualAge 6, GNU make (3.77+), ANSI C compiler