Building MathMore in 5.34/21

I’m trying to do a build of v5.34/21 that includes MathMore on a SL6 system.

After downloading the code using git and cd’ing to the newly created ROOT directory, I checkout the desired version with
git checkout v5-34-21
and then execute
./configure --enable-minuit2 --enable-roofit --enable-mathmore
But the output from the configuration command states
Checking whether to build libMathMore … no
and if I continue with the make, libMathMore is indeed not built.

Am I doing something wrong? Does anyone know how to make this work?

Bill H.

mathmore -> Build the new libMathMore extended math library, requires GSL (vers. >= 1.10, both the binary libraries and the development files must be installed).