Log Message:
libcerf: updated to 2.4

libcerf-2.4, released 2aug23:
  - CMake: runtime destination corrected (bin, not lib)
  - CMake: removed option PORTABLE and compiler flag -march (unavailable on some \ 
architectures)

libcerf-2.3, released 10jan23:
  - Fix compiler flags; use -O3 for Release
    - Introduce CERF_COMPILE_OPTIONS to let users overwrite the hard-coded \ 
compile options
  - Under gcc, use -march=native
    - PACKAGE MAINTAINERS: use -DPORTABLE=ON to override this !!
  - Add test coverage for erfcx, dawson, im_w_of_x (against nearby complex and \ 
status quo)
  - Avoid some divisions in function voigt (suggested by Alexander Kleinsorge)
  - Accelerate lookup in erfcx, im_w_of_x (avoid long switch, contributed by \ 
Alexander Kleinsorge)
  - Work around clang bug https://github.com/llvm/llvm-project/issues/59681 \ 
(0+I*Inf->NaN)

libcerf-2.2, released 7nov22:
  - No longer raise underflow error in w_of_z for large real arg (contributed by \ 
Ethan Merritt)
  - In test suite, confound zero with values close to underflow
  - Remove some invisible files that had slipped in accidentally (noticed by \ 
Christoph Junghans)
  - Windows binary now built with Visual Studio 17 2022

libcerf-2.1, released 8apr22:
  - Provide cerfConfig.cmake (contributed by Lori A. Burns and Christoph Junghans)
  - libcerf.pc: Remove hard-coded lib/
  - Version number incremented to overcome upstream problems with withdrawn \ 
release 2.0

libcerf-1.17, released 29jun21:
  - Correct pkgconfig installation directory (use GNU install dirs, install to \ 
LIBDIR/pkgconfig)

libcerf-1.16, released 23jun21:
  - voigt_hwhm: replaced Newton's method (which failed for rare parameter \ 
combinations)
      by Illinois regula falsi (contributed by Ethan A Merritt)
  - Some internal cleanup, especially of include directives

libcerf-1.15, released 10jun21:
  - Use assertion in voigt_hwhm to check for impossible situations
      (to avoid fprintf and exit, as suggested by Ethan A Merritt)
  - Added widthtest, which tests voigt_hwhm for numerous ratios gamma/sigma
  - libcerf.pc.in: correct prefix (as suggested by Alexander Grund)
  - CMake install
    - make full use of CMAKE_INSTALL_<dir> variables
    - DESTINATION now given by LIBDIR from GNUInstallDirs
  - Support CPack for all platforms

libcerf-1.14, released 19oct20:
  - Simplified test code
  - Homepage moved to https://jugit.fz-juelich.de/mlz/libcerf, 17mar19