gtest-roofit-roofitcore-testRooFitCore runs but fails if fftw3.h is not available

With:

$ rg fftw3 CMakeCache.txt 
2380:builtin_fftw3:BOOL=OFF
2599:fftw3:BOOL=OFF

gtest-roofit-roofitcore-testRooFitCore runs but fails with:

[ RUN      ] RooHistPdf.EnsurePositiveValuesInFFTConvPdf
input_line_325:1:10: fatal error: 'fftw3.h' file not found
#include "fftw3.h"
         ^~~~~~~~~
[#0] ERROR:Eval -- RooFFTConvPdf evaluation Failed! The interpreter could not find the fftw3.h header.
You have three options to fix this problem:
    1) Install fftw3 on your system so that the interpreter can find it
    2) In case fftw3.h is installed somewhere else,
       tell ROOT with gInterpreter->AddIncludePath() where to find it
    3) Compile ROOT with the -Dfftw3=ON in the CMake configuration,
       such that ROOT comes with built-in fftw3 convolution routines

unknown file: Failure
C++ exception with description "RooFFTConvPdf evaluation Failed! The interpreter could not find the fftw3.h header" thrown in the test body.

[  FAILED  ] RooHistPdf.EnsurePositiveValuesInFFTConvPdf (38 ms)

The issue also affects gtest-roofit-roofitcore-testRooWorkspace:

[#1] INFO:ObjectHandling -- RooWorkspace::import(workspace) importing RooRealVar::sigma
[#1] INFO:Eval -- RooRealVar::setRange(x) new range named 'refrange_fft_signal' created with bounds [980,1090]
input_line_40:1:10: fatal error: 'fftw3.h' file not found
#include "fftw3.h"
         ^~~~~~~~~
[#0] ERROR:Eval -- RooFFTConvPdf evaluation Failed! The interpreter could not find the fftw3.h header.
You have three options to fix this problem:
    1) Install fftw3 on your system so that the interpreter can find it
    2) In case fftw3.h is installed somewhere else,
       tell ROOT with gInterpreter->AddIncludePath() where to find it
    3) Compile ROOT with the -Dfftw3=ON in the CMake configuration,
       such that ROOT comes with built-in fftw3 convolution routines

unknown file: Failure
C++ exception with description "RooFFTConvPdf evaluation Failed! The interpreter could not find the fftw3.h header" thrown in the test body.

[  FAILED  ] RooWorkspace.Issue_10577 (5 ms)

Thanks for opening an issue about this! I'm aware of this, and my idea to fix it was to get rid of the fftw3.h dependency altogether.

The PR was coincidentally opened just 2 days ago:

[RF] Drop the FFTW3 dependency of RooFFTConvPdf #24012

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gtest-roofit-roofitcore-testRooFitCore runs but fails if `fftw3.h` is not available #24045

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gtest-roofit-roofitcore-testRooFitCore runs but fails if fftw3.h is not available #24045

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pcanal commented on Nov 6, 2026

guitargeek commented on Nov 6, 2026

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gtest-roofit-roofitcore-testRooFitCore runs but fails if `fftw3.h` is not available #24045