Changes in FLTK 1.5.0 Released: xxx yy 2026 This is the first FLTK release that exclusively uses CMake to be built. autoconf/configure/Makefile support has been removed. If you believe you need configure/make, then please use FLTK 1.4.x. Bug Fixes and other Improvements Platform Specific Fixes and Build Procedure Improvements - macOS: required SDK version and deployment target changed to 10.5 or higher Wayland related Improvements and Fixes Fixes and Improvements in Fluid Documentation Improvements Other Changes - Removed autotools (configure/make) support - Requires C++11 or higher Changes in FLTK 1.4 See CHANGES_1.4.txt Changes in FLTK 1.3 See CHANGES_1.3.txt Changes in FLTK 1.1 See CHANGES_1.1.txt Changes in FLTK 1.0 See CHANGES_1.0.txt