The following are not necessary with recent versions of FFTW, which should automatically guess the compiler flags described below. Please let us know if you have any problems installing FFTW on HP-UX.
Marc Lefranc informed
us that the C compiler in HP-UX 10.10 is not ANSI-compatible by
default; this confuses the configure scripts and breaks
the compilation.
To fix this, he suggests the following sequence of instructions to configure and compile FFTW:
setenv CC "cc -Ae" ./configure make CFLAGS="-Ae +O3 +Oall"