State on UNIX systems
~~~~~~~~~~~~~~~~~~~~~

Source releases starting from 1.1.2 should compile and run out-of-the-box
on old UNIX systems, such as IRIX. Does NOT require any GNU installed.

Requirements:
  - x11 and motif (for the GUI)
  - an awk implementation that supports gsub(), e.g. nawk

1. ./configure

2. make

Considerations listed in ../INSTALL apply.

The above procedure has been tested on IRIX 5.3 on IP22.

Expected compilation times [minute:second]:

pcb-rnd  ./configure       compile, -O0     compile -O3   system
-----------------------------------------------------------------------------------
1.1.2     1:55              7:40             14:27        IRIX 5.3, IP22 @ 100 MHz
2.3.1     0:20              1:47             7:52         AIX 7, Power7
3.0.0     3:25             28:20                          IRIX 5.3, IP22 @ 100 MHz (no GUI)

3. per UNIX system notes

3.1. AIX

It is possible to compile pcb-rnd using gtk2.0 but due to a non-standard
AIX libc header, this needs extra CFLAGS for configure:

 ./configure CFLAGS=-D_LINUX_SOURCE_COMPAT

Without that, gtk is not detected becaus of name clash between gtk and
AIX libc on func_data.

