File _multibuild of Package fftw3
<multibuild> <package>standard</package> <package>gnu-hpc</package> <package>gnu-openmpi4-hpc</package> <package>gnu-mvapich2-hpc</package> <package>gnu-mpich-hpc</package> </multibuild>
<multibuild> <package>standard</package> <package>gnu-hpc</package> <package>gnu-openmpi4-hpc</package> <package>gnu-mvapich2-hpc</package> <package>gnu-mpich-hpc</package> </multibuild>