When the FLTK source tree is downloaded from the "download" section of www.fltk.org,
rather than from its github git repo, CMake building fails with

fatal: not a git repository: '/home/xxxx/fltk-1.4.x/.git'

CMake Error at documentation/CMakeLists.txt:53 (string):
  string sub-command REPLACE requires at least four arguments.

The error disappears if OPTION_BUILD_HTML_DOCUMENTATION which is on by default is turned off.

The error comes from documentation/CMakeLists.txt executing command
git --git-dir=${CMAKE_SOURCE_DIR}/.git rev-parse --short=10 HEAD
which fails if ${CMAKE_SOURCE_DIR} is not a git repo.

@Albrecht-S : That could be fixed by setting the default value of this option according to whether the source tree contains a .git directory, or by replacing the output of the git command by something else. What do you think ?

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