Gfilui

I am installing P3DFFT in ubuntu. I downloaded the ".tar.gz" file for it and extracted. Then used the "./configure" command. The configure gave the following error,
" configure:error:You must choose to use either ESSL or FTTW "
I have istalled the FTTW lib before P3DFFT. Please help me on this error.

Thanks

As you do not specify your Ubuntu version I tested the method below on two supported LTS versions - Ubuntu 16.04 LTS (Xenial Xerus) and Ubuntu 18.04 LTS (Bionic Beaver).

Install FFTW-related developer packages and build-dependencies. Do not forget to enable source code repositories in Software & Updates (software-properties-gtk) before you proceed.

Then run:

sudo apt-get install -y libfftw3-dev libfftw3-mpi-dev libopenmpi-dev gfortran
sudo apt-get build-dep -y libfftw3-dev libfftw3-mpi-dev

Download and extract P3DFFT package:

cd ~/Downloads
wget https://github.com/sdsc/p3dfft/archive/v2.7.6.tar.gz
tar -xf v2.7.6.tar.gz
cd p3dfft-2.7.6/

As it was already written by @steeldriver:

The first thing to note is that the argument to --with-fftw
must be the top level path to the FFTW3 header files and libraries. So
for example if the headers are in /usr/include and the libraries are
under /usr/lib (the default, when package libfftw3-dev is
installed from the Ubuntu repository), the value should be given as
--with-fftw=/usr

The additional issue in this case is that the provided configure
script appears to be hard-wired to look in only the lib and lib64
subdirectories:

 3315 if test -e $withfftw/lib/libfftw3.a ; then
 3316 FFTW_INC="-I$withfftw/include"
 3317 
 3318 FFTW_LIB="$withfftw/lib/libfftw3.a"
 3319 
 3320 elif test -e $withfftw/lib64/libfftw3.a ; then
 3321 FFTW_INC="-I$withfftw/include"
 3322 
 3323 FFTW_LIB="$withfftw/lib64/libfftw3.a"
 3324 
 3325 else
 3326 as_fn_error $? "libfftw3.a was not found in given location!" "$LINENO" 5
 3327 fi

The use of a lib64 subdirectory is an old convention that pre-dates
Debian's Multiarch framework - the modern location for 64-bit
libraries would be lib/x86_64-linux-gnu

So you need to patch the configure script. You can do it with commands below:

sed -i 's/$withfftw/include//usr/include/g' configure
sed -i 's/$withfftw/lib64//$withfftw//g' configure
sed -i 's/$withfftw/lib//$withfftw//g' configure

Then run new patched configure script with correct options:

./configure --enable-fftw --with-fftw=/usr/lib/x86_64-linux-gnu

Then run the compilation and installation:

make
sudo make install