Get the latest version of Corsika from here:
https://www.ikp.kit.edu/corsika/

Extract Corsika
{{{
[0] tar xvf corsika-76400.tar.bz2
}}}

Call coconut
{{{
[1] cd corsika-76400
[2] ./coconut
}}}

You can use the defaults (just press return) for

* Compile in 32 or 64bit mode? [64 bit]
* Which high energy hadronic interaction model do you want to use? [QGSJET 01C]
* Which low energy hadronic interaction model do you want to use? [GHEISHA 2002d]
* Which detector geometry do you have? [horizontal flat]

Now you should get a long list of possible options
{{{
Which additional CORSIKA program options do you need?
}}}

Enter
{{{
(multiple selections accepted, leading '-' removes option): 1a 1b 1c 1e 7c 9 
}}}

There options correspond to: CERENKOV, IACT, CEFFIC, TRAJECT, VIEWCONE and ATMEXT.

Now you will get asked more question, answer them as follows
* Cherenkov light vertical (longitudinal) distribution option? [only in step]
* Do you want Cherenkov light emission angle wavelength dependence? [depending on wavelength] {This corresponds to the CERWLEN option}
* IACTEXT external output file option? [not stored] {no eventio format}

Now, coconut can create the input files, configure the make system and make. To proceed, select  `*** Finish selection ***`.

You should see
{{{
 Are you sure you want to continue with these current option selection:
    BERNLOHRDIR IACT TRAJECT CEFFIC CERENKOV CERWLEN IACTDIR VIEWCONE ATMEXT
    yes or no ? (default: yes) >
}}}

Which you acknowledge. Now, go ahead!

= Options =

CEFFIC: All three look-up-tables (QE, Atmabs, Mirror) are limited to 105 values between 180nm and 700nm -> This turns the extension to 2000nm in the IACT option off

IACT: Redirects photons to eventio (telescope.dat) file (CER files exists, but only for one telescope and it is empty), extends wavelength range to 2000nm.

IACTEXT: Write also particles to eventio file

CEFFIC/CERWLEN: The 8-th number (production height) of each photon is replaced by the wavelength

{{{#!fortran
C  LIMITING FACTOR FOR STEP SIZE OF ELECTRON IN MAGNETIC FIELD
#if __CERENKOV__ && __IACT__
C  LIMIT IN DEFLECTION ANGLE IS 2.5 MILLIRADIAN = 0.143 DEG
C  WE USE A LIMIT OF ABOUT 0.05 DEG (APPROX. 1 MILLIRAD)
      BLIMIT   = 0.001D0 / BNORM
#else
C  WE USE A LIMIT OF ABOUT 11.4 DEG (0.2 RAD)
      BLIMIT   = 0.2D0 / BNORM
#endif
}}}

This is from the muon tracking (MUTRAC)

{{{#!fortran
#if __CERENKOV__ && __IACT__
C  SCATTERING ANGLES OF MUONS SHOULD BE SMALLER THAN THE PIXEL SIZE.
*     AUX = MIN( 1.D0, 0.015D0*GAMMA )
C  THE SAME SHOULD HOLD FOR DEFLECTION IN THE GEOMAGNETIC FIELD.
C  HERE USING A MAXIMUM RMS SCATTERING / DEFLECTION ANGLE OF 0.05 DEG
C  AND APPROXIMATE ALL BETA*GAMMA TERMS BY GAMMA.
Cxx      Write(*,*) 'mu step old-style step=',MIN( 1.D0,0.015D0*GAMMA )
C  FOR A MEAN SCATTERING ANGLE THETA WE HAVE A STEP LENGTH OF ABOUT
C  (THETA / (13.6 MEV/(BETA*C*P))**2 RADIATION LENGTHS (PDG),
C  NOT TAKING INTO ACCOUNT THE NON-GAUSSIAN PART OF THE DISTIBUTION.
C  FOR THE MOMENT DON''T CARE ABOUT THE DIFFERENCE BETWEEN THE
C  'COULOMB SCATTERING LENGTH' 37.7 G/CM**2 (=C(21)) AND THE
C  RADIATION LENGTH OF 36.66 OR 36.62 G/CM**2 IN AIR.
C  NOTE: PI/180/(13.6 MEV/(BETA*C*P)) APPROX 0.136*GAMMA FOR MUONS.
      AUX = MIN( 1.D0, ((0.05*0.136)*GAMMA)**2 )
      IF ( BNORMC .GT. 0.D0 ) THEN
C  NOTE: PI/180*PAMA(5)*BETA*GAMMA APPROX 0.00185*GAMMA
         AUX = MIN( AUX, (0.05*0.00185)*GAMMA*RHOF(H)/(BNORMC*C(21)) )
      ENDIF
Cxx      Write(*,*) 'mu step new-style step=',AUX
#else
      AUX = MIN( 10.D0, 0.015D0*GAMMA )
#endif
}}}

For me this seems only relevant if someone wants to backtrack a single muon, i.e. determin its arrival direction.