function (disallow_intree_builds)
# Adapted from LLVM's toplevel CMakeLists.txt file
if( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE )
message(SYSTEM_ERROR_FATAL "
In-source builds are not allowed. CMake would overwrite the
makefiles distributed with utf8proc. Please create a directory
and run cmake from there. Building in a subdirectory is
fine, e.g.:
mkdir build
cd build
cmake ..
This process created the file `CMakeCache.txt' and the
directory `CMakeFiles'. Please delete them.
")
endif()
endfunction()
