[gmx-users] "cannot compute sizeof (int), 77" on AIX 5.3 PPC p575 (searched the list)

Mark Abraham Mark.Abraham at anu.edu.au
Thu Nov 8 02:36:45 CET 2007

liu xin wrote:
> Dear GMXers
> I got the error message " cannot compute sizeof (int)" when I tried to 
> configure GMX3.3.1 on IBM PPC p575 AIX5.3, this is how I did it:
> for fftw2.1.5
> export CC="xlc_r -q64 -qhot"
> export CXX="xlC_r -q64 -qhot"
> export OBJECT_MODE=64
> export FFLAGS="-O3 -qarch=pwr4 -qtune=pwr4 -qmaxmem=-1"
> export CFLAGS="-O3 -qarch=pwr4 -qtune=pwr4 -qmaxmem=-1"
> ./configure --prefix=/home/usr/programs/fftw215 --enable-float 
> --enable-mpi --enable-thread
> make
> make install
> for GMX3.3.1
> export CPPFLAGS=-I/home/usr/programs/fftw215/include
> export LDFLAGS=-I/home/usr/programs/fftw215/lib
> ./configure --prefix=/home/usr/programs/gromacs331mpi --with-fft=fftw2 
> --without-x --disable-fortran --enable-mpi --enable-float
> then I got the following error:
> checking size of int... configure: error: cannot compute sizeof (int), 77

So the program configure tries to compile and run to check the size of 
int didn't work.

> have you guys ever experienced this problem before? Any suggestions are 
> appreciated!

Look at the last several hundred lines of output in config.log and see 
what the problem was.


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