See also this report for MSYS2: msys2/MINGW-packages#8806

The fltk-config program that is installed by MSYS2 returns the following:

$ fltk-config --use-gl --ldflags
-L/mingw64/lib -lfltk_gl -lGLU -lGL -lfltk -lpthread

AFAICT, there are no GLU or GL libraries on Windows. Instead of -lGLU -lGL these flags should probably contain -lopengl32 -lglu32.

That causes linker issues when trying to compile projects that use fltk-config to get the linker flags for FLTK with OpenGL support.

It would be nice if fltk-config on Windows could return flags that can be used for successful linking on MinGW.

@revelator suggested the following patch in the above issue which works for me:

diff -urN fltk-release-1.3.5.a/CMake/options.cmake fltk-release-1.3.5.b/CMake/options.cmake
--- fltk-release-1.3.5.a/CMake/options.cmake	2019-03-03 09:40:23.000000000 +0100
+++ fltk-release-1.3.5.b/CMake/options.cmake	2021-06-13 02:41:02.238878100 +0200
@@ -150,7 +150,11 @@
 
 if(OPENGL_FOUND)
    set(CMAKE_REQUIRED_INCLUDES ${OPENGL_INCLUDE_DIR}/GL)
-   set(GLLIB "-lGLU -lGL")
+   if(WIN32)
+     set(GLLIB "-lglu32 -lopengl32")
+   else()
+     set(GLLIB "-lGLU -lGL")
+   endif(WIN32)
 
    # check if function glXGetProcAddressARB exists
    set(TEMP_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})

Would that change be ok in general?

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