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On HP-UX, the default C compiler is not ANSI C compatible. If GNU CC is not installed, it is recommended to use the following options in order to use an ANSI C compiler:
./configure CC="cc -Ae"
and if that doesn't work, install pre-built binaries of GCC for HP-UX.
On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
parse its <wchar.h> header file. The option -nodtk can be
used as a workaround. If GNU CC is not installed, it is therefore
recommended to try
./configure CC="cc"
and if that doesn't work, try
./configure CC="cc -nodtk"